Here is the setup: Phantom 2 Vision with 3D Power Brushless Gimbal controlled through Simple BGC board. The set up worked fine for a while. Then I started getting this problem with the camera erratically pitching and becoming unstable. When I power the Phantom up, the camera/gimbal is steady with no erratic behavior. When I power it up with no blades on it and move it around by hand, it is absolutely normal. Then when I fly it, it starts the pitching behavior. Any help is appreciated. I have two videos. The first is powered on, no blades, handheld movement of the Phantom. The second video is full power and acceleration. This is where you see the issue.