Two weeks ago I was flying my P2V+ and recording. When I viewed the recording, I noticed that at one point the horizon was tilted to the left. Then after a few minutes it leveled out. Then it was tilted to the right,and eventually leveled out again. I tested this at home, and found that the roll would sometimes stay tilted to the left or to the right. If I tilted the running Phantom the opposite direction, the camera would level out. I tried recalibrating the IMU. No difference. I check the roll motor shaft, and it was parallel to the camera. I used compressed air to blow out the motor, thinking something was on the windings. Finally I figured it might be a software problem, so I did a hard reset and then calibrated the IMU again. It seemed to make a difference, and I put it away for the night. Today I was working on a different gimbal. When I was done I put it on the Phantom from last night. It did the same thing with tilting both left and right. The only thing the two have in common are the Phantom. I can't imagine that the gray wires would cause a problem, or the flight control module, but who knows? Any ideas?