After switching to drive from reverse the nav display would not switch back from the back up camera while driving ahead, when a car would be anywhere near mine on the road, still in drive, whether idle at a stop light or in motion on the street, the back up sensors that respond to passing cars did not beep. i tried pressing the back button, nav button, settings button & turning the car on/off all failing to fix the problem. the camera remained on even while in park once i arrived home.