I've noticed recently that my phantom 2 is vibrating a fair amount. Enough that it shows up in the video I shoot, it's definitely a new occurrence and I'm not really sure what could be causing it or how to try and fix it. I re-calibrated the compass and did an IMU calibration as well in the software assistant, and neither of those things made a difference. The first time I noticed it was my first flight with the Hero 4. I've also tested it with a Hero 3 since then, and it was still vibrating. Anyone have any ideas?