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D-Link DSL Modem/Routers => Other DSL modem/routers => Topic started by: hmmm on February 15, 2014, 04:11:36 PM

Title: 2890AL Router disconnects and fails to reconnect
Post by: hmmm on February 15, 2014, 04:11:36 PM
Hello,

For the last week or so my 2890AL router will randomly disconnect from the internet and won't reconnect, or at least appears to attempt to reconnect but fails continuously.

I've updated to the latest firmware AU_1.02.04. I'm based in Australia and my connection is ADSL2+. My ISP has done a line test and couldn't see anything wrong.

Usefully, I set up syslogging and below is an excerpt for when the modem disconnects, at 07:34:53. Advice would be appreciated!

2014-02-16 04:05:02   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 04:05:02   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 04:20:05   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 04:20:05   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 04:20:06   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 04:20:06   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 04:20:06   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 04:30:11   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 04:30:11   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 04:30:11   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 04:30:11   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 04:30:11   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 04:30:12   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 04:30:12   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 04:37:35   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from YY:YY:YY:YY:YY:YY.
2014-02-16 04:37:35   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.6.
2014-02-16 04:37:35   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from YY:YY:YY:YY:YY:YY.
2014-02-16 04:37:35   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.6. (Lease time = 86400)
2014-02-16 04:37:36   Local7.Debug   192.168.1.1   WIFI: Got new client [YY:YY:YY:YY:YY:YY] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 04:45:13   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 04:45:13   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 04:45:13   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 04:45:14   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 04:45:14   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 04:58:00   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 04:58:01   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 04:58:01   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 04:58:02   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 04:58:02   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 05:13:04   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 05:13:04   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 05:13:04   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 05:13:04   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 05:13:05   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 05:13:05   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 05:13:05   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 05:23:10   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 05:23:10   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 05:24:06   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 05:24:06   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 05:24:07   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 05:24:07   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 05:24:07   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 05:34:10   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 05:34:10   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 05:34:10   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 05:34:11   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 05:34:11   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 05:38:21   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from YY:YY:YY:YY:YY:YY.
2014-02-16 05:38:21   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.6.
2014-02-16 05:38:21   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from YY:YY:YY:YY:YY:YY.
2014-02-16 05:38:21   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.6. (Lease time = 86400)
2014-02-16 05:38:22   Local7.Debug   192.168.1.1   WIFI: Got new client [YY:YY:YY:YY:YY:YY] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 05:49:12   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 05:49:12   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 05:49:13   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 05:49:13   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 05:49:13   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 06:03:20   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from XX:XX:XX:XX:XX:XX.
2014-02-16 06:03:20   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.3.
2014-02-16 06:03:21   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 06:03:21   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 06:03:21   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 06:19:10   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 06:19:10   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 06:19:10   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 06:34:05   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 06:34:05   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 06:34:06   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 06:39:07   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive DISCOVER from YY:YY:YY:YY:YY:YY.
2014-02-16 06:39:07   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending OFFER of 192.168.1.6.
2014-02-16 06:39:07   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from YY:YY:YY:YY:YY:YY.
2014-02-16 06:39:07   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.6. (Lease time = 86400)
2014-02-16 06:39:07   Local7.Debug   192.168.1.1   WIFI: Got new client [YY:YY:YY:YY:YY:YY] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 06:49:00   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 06:49:00   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 06:49:01   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 07:03:55   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 07:03:55   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 07:03:56   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 07:18:50   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 07:18:50   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 07:18:51   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 07:22:29   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 07:22:29   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 07:22:30   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 07:33:46   Local7.Debug   192.168.1.1   WIFI: Got new client [XX:XX:XX:XX:XX:XX] associated from BAND24G-1.1 (2.4 Ghz)
2014-02-16 07:33:47   Local7.Debug   192.168.1.1   syslog: DHCP: Server receive REQUEST from XX:XX:XX:XX:XX:XX.
2014-02-16 07:33:47   Local7.Debug   192.168.1.1   syslog: DHCP: Server sending ACK to 192.168.1.3. (Lease time = 86400)
2014-02-16 07:34:51   Local7.Debug   192.168.1.1   pppd[5971]: PPP: No response to [14] LCP echo requests.
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[7326]: exiting on receipt of SIGTERM
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[5394]: started, version 2.45 cache disabled
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[5394]: compile time options: IPv6 GNU-getopt no-RTC no-ISC-leasefile no-DBus no-I18N no-TFTP
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[5394]: warning: no upstream servers configured
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[5394]: read /etc/hosts - 6 addresses
2014-02-16 07:34:57   Local7.Debug   192.168.1.1   pppd[5971]: PPP: Connection terminated.
2014-02-16 07:34:58   Local7.Debug   192.168.1.1   pppd[5971]: PPPoE: Sending PADT for WAN-1. (Session ID: 15dd)
2014-02-16 07:35:03   Local7.Debug   192.168.1.1   pppd[5971]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:35:08   Local7.Debug   192.168.1.1   pppd[5971]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:35:18   Local7.Debug   192.168.1.1   pppd[5971]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:35:22   Local7.Debug   192.168.1.1   dnsmasq[1359]: no servers found in /etc/resolv.conf, will retry
2014-02-16 07:35:39   Local7.Debug   192.168.1.1   pppd[5971]: Exit.
2014-02-16 07:35:44   Local7.Debug   192.168.1.1   pppd[5901]: pppd 2.4.2b3 started by root, uid 0
2014-02-16 07:35:44   Local7.Debug   192.168.1.1   pppd[5901]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:35:49   Local7.Debug   192.168.1.1   pppd[5901]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:35:59   Local7.Debug   192.168.1.1   pppd[5901]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:36:19   Local7.Debug   192.168.1.1   pppd[5901]: Exit.
2014-02-16 07:36:24   Local7.Debug   192.168.1.1   pppd[6258]: pppd 2.4.2b3 started by root, uid 0
2014-02-16 07:36:24   Local7.Debug   192.168.1.1   pppd[6258]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:36:29   Local7.Debug   192.168.1.1   pppd[6258]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:36:39   Local7.Debug   192.168.1.1   pppd[6258]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:36:59   Local7.Debug   192.168.1.1   pppd[6258]: Exit.
2014-02-16 07:37:04   Local7.Debug   192.168.1.1   pppd[6611]: pppd 2.4.2b3 started by root, uid 0
2014-02-16 07:37:04   Local7.Debug   192.168.1.1   pppd[6611]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:37:09   Local7.Debug   192.168.1.1   pppd[6611]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:37:19   Local7.Debug   192.168.1.1   pppd[6611]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:37:39   Local7.Debug   192.168.1.1   pppd[6611]: Exit.
2014-02-16 07:37:44   Local7.Debug   192.168.1.1   pppd[6963]: pppd 2.4.2b3 started by root, uid 0
2014-02-16 07:37:44   Local7.Debug   192.168.1.1   pppd[6963]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:37:49   Local7.Debug   192.168.1.1   pppd[6963]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:37:59   Local7.Debug   192.168.1.1   pppd[6963]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:38:19   Local7.Debug   192.168.1.1   pppd[6963]: Exit.
2014-02-16 07:38:24   Local7.Debug   192.168.1.1   pppd[7324]: pppd 2.4.2b3 started by root, uid 0
2014-02-16 07:38:24   Local7.Debug   192.168.1.1   pppd[7324]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:38:29   Local7.Debug   192.168.1.1   pppd[7324]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:38:39   Local7.Debug   192.168.1.1   pppd[7324]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:38:59   Local7.Debug   192.168.1.1   pppd[7324]: Exit.
2014-02-16 07:39:04   Local7.Debug   192.168.1.1   pppd[7690]: pppd 2.4.2b3 started by root, uid 0
2014-02-16 07:39:04   Local7.Debug   192.168.1.1   pppd[7690]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:39:09   Local7.Debug   192.168.1.1   pppd[7690]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:39:19   Local7.Debug   192.168.1.1   pppd[7690]: PPPoE: Sending PADI for WAN-1.
2014-02-16 07:39:39   Local7.Debug   192.168.1.1   pppd[7690]: Exit.  
Title: Re: 2890AL Router disconnects and fails to reconnect
Post by: FurryNutz on February 16, 2014, 09:59:45 AM
Link>Welcome! (http://forums.dlink.com/index.php?topic=41537.0)

FW Update Process (http://forums.dlink.com/index.php?topic=42457.0)

Internet Service Provider and Modem Configurations


Wireless Configurations
Links>Wireless Installation Considerations (http://forums.dlink.com/index.php?topic=48327.0) and Managing Signal Congestion (http://forums.dlink.com/index.php?topic=53228.0) and Good Neighbour Policy (http://forums.dlink.com/index.php?topic=10634.0)
Title: Re: 2890AL Router disconnects and fails to reconnect
Post by: hmmm on February 16, 2014, 10:55:12 PM
Hello,

I will answer as best I can.

- I have four devices connected wirelessly and three devices connected wired. Not all devices are on at the same time.
- Factory reset has been performed, yes.
- Factory reset was performed after the firmware update.
- This issue was occurring prior to the firmware update as well. I've had the modem for 2 months. Despite poor wireless performance, the modem performed without issue during this time.

- MTU was double checked with ISP and was correctly set to 1492 in the modem settings.
- Under PPPoE, "Always On" was enabled.

- SSID was changed to a custom name.
- I enabled both 2.4Ghz and 5Ghz, mixed on both. On a side note, prior to this problem occurring, I would witness random dropped pings when pinging 192.168.1.1 continuously, via both 2.4 and 5Ghz wireless connection. When the problem started and the modem would disconnect, I experienced little to no dropped pings.
- Channel width was set to Auto.
- Channel was set to 5 for 2.4Ghz. 5Ghz was left at default.
- Security mode was set to WPA2 for both frequencies.
- No cordless house phones, I have naked DSL. No phones apart from my iPhone. No back to base alarms.
- Plenty of wifi routers in the area, annoyingly - I'm not convinced this is related to my wireless connections though. Firstly, the wireless connectivity remains unchanged (or gets better) after the modem disconnects and secondly, I witnessed the disconnection when wifi was off as well.
- The advanced wireless settings were unchanged apart from the frequency strength which I set to 'low' on both frequencies.

I'd like to know what is actually happening to result in the following messages, or simply an explanation into what these messages mean. I googled and found related information here and there but nothing to solidify my understanding. What is the dnsmasq, SIGTERM? Why would dnsmasq exit and from what? What does it mean that no upstream servers are configured? I presume that whatever the dnsmasq is doing is resulting the the PPP connection to be terminated?

2014-02-16 07:34:51   Local7.Debug   192.168.1.1   pppd[5971]: PPP: No response to [14] LCP echo requests.
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[7326]: exiting on receipt of SIGTERM
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[5394]: started, version 2.45 cache disabled
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[5394]: compile time options: IPv6 GNU-getopt no-RTC no-ISC-leasefile no-DBus no-I18N no-TFTP
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[5394]: warning: no upstream servers configured
2014-02-16 07:34:53   Local7.Debug   192.168.1.1   dnsmasq[5394]: read /etc/hosts - 6 addresses
2014-02-16 07:34:57   Local7.Debug   192.168.1.1   pppd[5971]: PPP: Connection terminated.
Title: Re: 2890AL Router disconnects and fails to reconnect
Post by: FurryNutz on February 19, 2014, 02:19:48 PM
Seems like this could be a signal on the phone lines as maybe the modem is not acquiring proper signal on the DSL line.

You might have the ISP physically check the phone lines and signals. Ask them to review there connection logs during this time frame when you notice the modem not working.