After I inserted a CB radio (yes, I still have one) into the 12v console port, my reverse camera started flickering intermittently. The dealer said I'd have to replace the whole radio unit, which you can imagine is quite expensive. I made a video of what it looks like but this forum doesn't seem to let me upload it. However, here is a still pic.
Still flickers when the cb is removed from power? Perhaps the 12v plug is faulty causing a ground issue. Or it's just coincidental? Maybe it's a bad camera connection on the back of the glovebox unit or at the camera itself. Camera needs power, ground and reverse sensing wires at the least. Just some ideas. Doubt it's helpful.
I have the same issue with my rearview camera at times. I even get an error message “park pilot error” occasionally when putting the car in reverse. I’ve taken it to the dealership multiple times and even replaced the unit in the glove box. They were unable to fix the issue. I read it could be a bad ground from the camera to the glove box but I don’t have the patience to go through the whole car like that lol