when my battery was dying, the first thing to lose power was the radio and there were no other signs of power loss except the amp as well. do you hear your amplifier shutting off too? - maybe check to see if your battery and charging system is good esp. battery terminals for tightness and corrosion, alternator belt etc would be step 1 for me, then maybe the plug behind the radio and wiring as it's right next to a lot of heating ducts and could go bad. that's newb advice for newbs tho, maybe you're further along...