Hello out there. Recently upgraded my phantom 2 to the latest version and did several flights. I then went to my iPad ground station programmed a couple of waypoints. Flight went off without incident and came back to the original position I allowed it to repeat the flight and on the first leg at some point the quad began to oscillate violently and descend rapidly until it crashed. Apparently the gimbal went crazy with violent oscillations and that seems to have brought down the phantom. Unable to get the gimbal working properly again. Any thoughts as to what went wrong and how do I get my gimbal working again