Dino, when I was messing with my camera switch box I remembered you saying you were going to have to make adjustments to your radio. Unplug the power and trigger wires from your switchbox if you haven't already. When you shift to reverse or use the turn signals the switchbox will try to take control of your radio for video inputs. With the box unplugged that should take care of your problems, I hope!!!
Oops! I should have looked at your other post about the wiring, I see the box is out and the wires are cut. Never mind!!!