We have a comcast modem, and a dlink wireless router at home. It has been working for 9 months no problem. Last week one day we lost the wireless access. The ethernet reported a network plug was disabled, but still could access the ethernet. I looked at the status of the LAN iom Windows - the default gateway had changed from 192.168.1.0, to 68.x.x.x - a comcast IP.
I replaced the router with a linksys wrt4g, hoping it was related to Dlink, but no such luck. We can reset the cable modem, then the router, and get wireless and wired working for about 12-15 hours straight, then we lose both. The default gateway in the status is again changed from 192.168.1.1 (Linksys) to 188.8.131.52 - I believe that is also comcast.
I have looked here and on other message boards and have tried a few things - disabling the VPN, changing the wireless channel to 11 for example. But I cannot get the network to stay up, and environmentally nothing changed when this happened. I thought perhaps comcast might have done something but if I bypass the router and plug into the cable modem directly I can get to the internet no problem without resetting.
I could use some help here, as I really am at my wits end. There are 2 windows machines and one mac connected wirelessly, one windows desktop running XP home media.