Hello FN, One important point is that the router worked just fine for many months before developing this issue, so I don't think it is interference. Now having said that, my knowledge of networking is pretty modest indeed, so let's go to work.
-------------------------
Unsure about "region". I am located in central Texas (is this what you were asking?) and we are out in the country so no other wifis close by.
Re: the 624:
It is a 10-12 year old router with limited options (and so it may time to retire it). The following are what I see on the pages under the HOME tab at the top.
---
On the Wireless page, choices are very restricted. I have named the SSID as "MasterB". Channel has a down arrow indicating a drop down choice, but if you click on it nothing happens. (The WiFi Scanner on my Android phone says it is broadcasting on Channel 6. Also it is at the far end of the house from the 655 which I have set to broadcast on 11) Right next to it is a box for Auto Select which I checked previously and saved it but upon auto refresh it returns unchecked.
Authentication choices are: open, shared, wpa and wpa-psk of which I have selected the latter
---
On the WAN page (which if I understand it is not relevant given the above and below, but please help me if incorrect), "Dynamic IP Address" is selected and I have not changed it. Should I change it to Static? Boxes for Primary and Secondary DNS's are both 0.0.0.0
---
On the LAN page, the lan address of the 624 is set to 192.168.0.2 and subnet is 255.255.255.0
---
On the DHCP page,
-DHCP is disabled under DHCP Server, lease time is one week (max available)
-Under Static DHCP, disabled is selected, and nothing is entered for name, in the fourth box of the IP address, or the mac address; and DHCP client is set to Clone (seems to be the only choice)
-under Static DHCP Client List, it shows the host name as MasterB, IP addy as 192.168.0.2 and MAC addy as 00-00-00-00-00-00
-------
Do you need any information from the ADVANCED, TOOLS, OR STATUS tabs?
--------------------------
Re: the 655
It's DHCP is on and the address range is set to 192.168.0.100 - 192.168.0.199. It is set to broadcast on channel 11.
-------------------------
Finally, the other secondary AP sits halfway between the two of them and broadcasts on channel 1. No problems with this one.
------------------------------------------------------
Do you see anything that needs changing, or is there any additional info that I can provide?