On 2 occasions (only had vehicle 3 weeks), Ive received a message on the screen that the camera is temporarily unavailable when in reverse. The message suggests I press the home button but didnt help. I then rebooted the Google based system by long pressing the home button again. After the reboot, hit the same message the camera is unavailable. I then tried to select the other cameras (side mirrors, front bumper), but nothing displayed.