shw4

the battery and alternator have been tested and are good. There is something wonky with the stereo system that has been progressively weirder, like it comes on randomly and the cd player doesn't play cds etc. Also it is the first thing to go dead. I notice the screen which shows the time and what audio system)cd/radio/tape) goes blank first before the car goes dead and it comes back when the car is charged. I don't know what to do?