I just got my bird back from dji for the 2nd time. The first time was for the no signal problem which seems like they fixed. But when I got it back I updated, cold imu calibration and went flying. Noticed it was drifting alot at hover and was shaking real bad. So I emailed them back and they wanted it sent back in. So I did. Got it back and they said they replaced... On the Aircraft: The Main Control Board Module The Lightbridge Transmitter On the camera: The FC300X Camera Main Board. fireware 1.6 My problem is now the vibration seems ok but it is still drifting, not bad but it use to stay perfectly still while hovering with no wind and now its not. But I did notice Sunday I went to go straight up at full throttle and after 3-4 seconds you can hear the motors cut to half power and it climbs very slow. I use to get to 350 feet in no time and now it takes over a minute to get there. I brought it back down and did it about 8 more times and every time at the 3-4 second mark you can hear the motors cutting to half power. Does anyone know why or is this a new feature I haven't heard about? I could not find anything on it.