So our backup camera is intermittently blacking out. We can't find any rhyme or reason to the blackouts, the camera screen is black but the "+" sign is still visible in the left corner, the header "please check your surroundings for safety" is still visible as is the car with backup proximity map in the right corner. The backup beeping still works but the screen is black. Of course it didn't occur when we took it to the dealer but it's happening about 50 percent of the time. anyone else having this issue?