thanks for the help guys. spoke with pioneer, their cs is horrible. they never admit to knowing that any issue exists, like with the back up input on the z1. but anyways.
i have the dash apart now and am waiting for this to happen again. the problem now is it wont happen. but i'll drive like this for a while to see if something happens.
migth take it to a local stereo place if it doesnt stop working soon.