Occasionally my radio will get "stuck" and be unable to be turned off even with car off. I have to pull the battery cable to fix it. This last time I reset it, I noticed when I put the car in reverse and the backup cam went on, suddenly it started showing me the white lines on display that show where the rear of the car is heading. I have never seen that before even when the car was new. Any ideas about why this happened? The lines disappeared again it seems just the one time it did that!