DJI-Ken
DJI team
Flight distance : 1515312 ft
United States
Offline
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If it's drifting then you didn't get a clean compass calibration and also do another IMU calibration.
As far as a slight altitude adjustment from Sport mode to stop is normal.
You say it cannot maintain altitude when hovering, if it's never been crashed, the sonar sensors are clean, you have nothing attached to the legs, on latest firmware, then I would say you need to send it in for repair.
Can you please get a video of it hovering and not keeping it's altitude, I would like to see that video and forward it on to R&D.
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