[dumb_ricer]

I don't know if I understand what your saying, but I would try changing the channel on the wireless router. You can choose between like 9 channels, and maybe it is causing interference on whichever channel you have it on.

It could also be a problem with the phone line itself. Do you have any computers connected directly to the router? I would see if it disconnects on a computer directly hooked up to the router. If it does, its a problem in the phone system itself.