I noticed my P3P drifting pretty bad while hovering 4 feet off the ground today. I would move left and right slowly and it would move forward about 10 feet. I may have found a fix for behavior. I powered down the phantom and powered down the remote and Pilot app. I then just powered on the remote and Pilot app and proceeded to calibrate the remote. When I powered up phantom and hovered again it was rock solid. This same thing happened to me when I updated to the current firmware. After a stick calibration the hover was solid again. Hope this helps someone with the same problem.