Yeah- happened to me the other day, I was in GPS mode - hovering 8 (2.5m) feet off of the ground and the unit just dropped even when throttle was applied. No possibility of VRS since I was stationary. Fortunately, I had a B rig with me. Had to send the unit back to DJI since the frame cracked and there was sand in the motors and gimbal motors. Battery was around 50% and was a fresh battery (less than 1 month old)