I don't think the amp has anything to do with it. There is the posibility that there is a problem with the light control circuit (part that dims the radio lights with the rest of the dash when you rotate the knob) but that is not likely since the lights go all the way out. I would guess it is a problem in the head unit itself, The only way to test that is to find another radio (if possible) and use that for awhile and see if the problem continues. If it turns out that it is the head unit the cost of repair could be about the same as a good aftermarket head unit so......Tell your significant other that it is much cheaper to get this cool XM ready head unit
