I've recently noticed problems with my 2621 router - it becomes unresponsive for about 10 minutes at a time, about 10 times a month. The router sits inbetween the outside world and servers which I routinely log in to - strangely, I've noticed that if I'm logged into my servers during these 10 minute outages, I remain logged in with no slowdown in responsivity. However, a ping from the server to the router hangs.
I'm not sure where to even being debugging the problem - I've enabled logging on the router but haven't noticed any messages which correlate strongly with the appearance of these events. Any suggestions on how to proceed would be greatly appreciated.