A cordless phone was placed near it (around a foot away), about 10 minutes before it stopped, but I don't see how that could have caused the actual problem. It's still providing DHCP to my local network, but it's not picking anything up from my ISP (cable connection which uses DHCP). Connecting the cable modem directly to a PC proves that my ISP is not at fault. A "firmware default" reset didn't help. Problem continues. It had DD-WRT firware on it, but replacing the firmware with the current Linksys standard version (4.30.5) didn't work. Same issue. The very interesting thing is, the cable modem WAS connected to the "internet" port (WAN port) of the router. Placing the cable modem into one of the standard LAN ports allows a cabled PC to connect to the internet, but not a wireless PC. Also, when connected this way, the PC appears to get it's IP directly from my ISP, not from the router's DHCP server. Any asssistance would be greatly appreciated.