what would cause radio to turn off after flickering for a while when driving and then completely turns off until you turn the car off and restart.also half an hour of driving turns on the check engine light,abs ,transmission lights on dash and the transmission goes in to limp mode.if this vehicle is not used for 2 days it will go flat.would a comfort relay cause such problem or a bad ground .please if there are any tchs out there that might have seen this it would be a great help