had an issue similar to this a few months back. kept thinking it was the relay board, also some days found car faulted out for no reason. the card that is plugged into the motherboard with the selector plugged into it turn out to be the cuplrit. also like elmcannic was hitting on is to check your power supplies at the controller as well as car station. it doesnt take much fluctuation in voltage to make it go haywire.
