I have two routers hooked up to a DSL modem. The first is an older Linksys wired router(might be BEFSR41) and the other is a newer Cisco Valet M20. The valet was added on recently to enable WiFi support for mobile devices. Recently, I've seem network problems in which about every minute all computers on the whole network, both WiFi and wired, get their internet connection aborted for 30 seconds after which it comes back. Just randomly, the Valet was turned off one day, and it seems the problem does not exist anymore.
I'm not sure what this problem is, but I can't seem to understand why/how the Valet would be able to affect the connection of computers not even connected to it. Is there an explanation that can prove the Valet could be causing this or is it just a symptom of another problem?