I've had my P3S since April this year. Recently I noticed some minor shaking side-to-side in my videos. I re-balanced my props and re-calibrated my gimbal, but no improvement. Today things got worse. Now with the Phantom sitting on a firm surface with the motors off, the gimbal spontaneously yaws slowly from side to side a few degrees more or less randomly. And yes, I checked the IMU calibration which was OK. Any suggestions? I'm guessing it has a trip to a DJI repair shop in its future. The P3S is running on firmware 1.2.40+, which was as received from the factory.