muddanas

My 99 TL is acting weird. The Radio and Navigation system are turning themselves off randomly and then turn back on a second later while I'm driving... Then I see the yellow maintenence light start flashing for a few seconds after the radio and navi come back on. Nothing else loses power including the headlights and climate control. Could it be a faulty fuse??? Anybody else ever have a problem like this??? No more warranty and I'm thinking I'll be paying through the a$$ to get the dealer to fix it.

Thanks,
Sri