Got this error on my Phantom3 advance. Camera went numb and makes three beeps and again and again. The video is transmitting, but no control or any action by thecamerea accept for the beeps. Phantom fires up and can fly. Did IMU calibration and gimbal calibration but still nothing. Checked the ribbon cable and all seems fine. Any advice?

I've had that happen if I turn it on without it being on a level surface...  So if I turn it on when it's on it's side, as I'm putting it down I think the camera doesn't initialise properly?