I bought a used P2V+ v3.0 about three weeks ago, used. The owner gave me a demo, and everything was fine. Before I flew it when I got home, I saw the thread about the v3.0 motor wires and the v2.0 ESC's. I checked mine, and it had the thin wire motors and v2.0 ESC's. I didn't fly it, and instead ordered v2.1 ESC's. I installed those, and replaced the thin motor wires with 18 AWG stranded. I've run the bird without props in the house to check things out, and everything has been fine. Today I took it out to a field to test it. I removed the working gimbal and replaced it with a non-working one I've used before on my P2V+ v2.0. The ribbon cable is disconnected at the roll and tilt motor boards, and the camera board. I had already calibrated the IMU last night on my pool table. I calibrated the compass before takeoff. It wouldn't hover, but instead was drifting all over, side to side, forward and back, and up and down. After I landed it, I felt the motors, and they were almost too hot to touch. There was a bit of a breeze, but it wasn't fighting a stiff wind. Any ideas what this might be? I didn't think to try a different battery, although I don't know how that would affect this.