I have this problem with my 3 years old WRT54G wireless router. The router is wired to my desktop computer, and i have a wireless laptop. The router seems to be working fine and I'm able to run smoothly on my desktop as long as I turn off the wireless signal on my laptop. But the moment I turn on the wireless signal and it connects to my router, the router dies. (And my desktop internet connection dies as well). I called the linksys support and apparantly they said my wireless subscription expired or something, and I have to pay 29.99 to renew it. I feel kind of iffy about the whole situation so i hung up. I have the latest firmware from linksys. Thank you!!!