Good Day,
I am a A1 user. I was having some of the problems that others are having. I am a noob when it comes to routers but am trying to learn. I got my 4500 a week ago. I have 3 wireless computers, 1 hardwired and 2 hardwired xbox 360. I wasn't having problems that I could see other than the transfer rate from 1 computer to another on the network was terrible, around 300kb/sec (wireless to wireless). I upgraded the firmware to 1.21b3 and was having the speed drop down to almost nothing and going back up, pages not loading on the internet when it was dropping off. I disabled Advanced DNS Service and DNS Relay but that didn't make any difference. I also turned off game fuel and wish but that didn't make any difference either. This would happen often so I changed a few settings and all has been good for the past 3 days.
What I did was:
1. Changed 802.11 mode to mixed, n/g only
2. Changed my wireless channel to 11
3. Changed channel width to auto 20/40 MHz
I use wireless all the time and download a lot. Haven't had any problems since I did that for the dropping of speed and being cut off. My wife uses the wired computer but not often, she hasn't said anything about it. I am still having a bit of trouble with file transfers within the network. I changed the WPA to WPA2 only and AES. This has doubled my transfer speed to the mid 600's kb/sec. My old USRobotics maxg router could transfer files at around 1.2mb/sec. I can download on my computer or whatever, the kids are on xbox live playing games and on their computers at the same time and there is no problems. I have Advanced DNS and DNS Relay enabled, wish and game fuel enabled. Don't know if what I did has anything to do with it or maybe it's just a fluke but it's working other than the transfer rate within the network. I have a 15MB cable connection and the router is using every last byte of it so no complaints there.