last time out half the stereo quit working and then the entire thing shut off. switched to both batteries thinking it was a voltage issue. half the stereo came back on. figured i would mess with at the house. went out yesterday and now the touch screen wont come on one amp is completely off other is in protect mode. have checked both batteries and they are reading good 13.5 volts, connections are tight on batteries, fixed a loose connection on battery switch. same results. help PLEASE!!!! also getting 12.77 volts at amps