I can remove the router and wire direct to the modem. If that's working I try another router.
That said I've lost count of routers with outdated firmware and very strange settings (other than changing the SSID and switching to WPA2) you keep making money with folk that enable the hidden SSID mode. My buddy loves that.
I am experiencing intermittent stoppages in internet connection, usually lasting 30sec-2mins. It happens maybe 10-12 times in a 6-hour computer session. How do I determine whether the problem is router, modem or cable feed?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic