I have now gone through 4 routers (2 Linksys WRT54Gs, a Netgear and the DLink DGL-4300) and I am still experiencing the same problem.
When I returned to my apartment after Thanksgiving, my router just stopped working on the WAN side (Firefox displays Looking for host...). After doing a reset, all works fine (wired) for about 5 minutes, and then the thing dies again. LAN works, but WAN bites the dust. I cannot ping IPs or domains on the internet.
After going thru this many routers and having the EXACT same thing happen on all of them, I am thinking it is an issue regarding the apartment building's internal network (connected to a T1) and how I have the router configured. The Cisco router for the building hands out192.168.1.x addresses. So my router hands out 192.168.0.x addresses. Could this be an addressing issue? Any suggestions?