My phantom 3 pro camera rocks back and forth along the horizon. I've done 14 IMU calibrations up to this point, all followed by a gimbal calibration. I can make it stop by hand but once I'm airborne whenever the aircraft moves to the right it twitches and rock back and forth again and need to bring it back and land it to make it stop by hand. It has the latest firmware and was installed correctly. What am I missing??