I recently encountered a problem with a "new" gimbal I purchased from ebay. When I turn on the solo and the camera, everything appears to be working fine. When I tilt down (pre flight) the gimbal won't tilt all the way down. By watching my controller, I'm guessing it stops at about 25degrees. When I'm flying the drone, the gimbal goes limp when it hits this 25 degree angle. I cannot regain control of the gimbal after it goes limp. The gimbal seems to work fine right up to the point it is tilted down to this angle. Any ideas whats going on and how to fix it?