A month or more ago i noticed the drone was requesting the compass calibration every time, no matter it was the same location or within a couple of km. As before it was asking for that on rare occasions and i mostly did it manually when seeing it was off on the map, it made me suspicious. I performed the IMU calibration a month ago and since then it asked me very few times to calibrate, when in different countries or location too far away from last point of flight. So in case anybody has noticed the same behavior you can try the IMU calibration, it might be helpful.

Hello there sbonev. I am sorry for the trouble this has caused and thank you for sharing these infraction with us. Just a reminder when doing the compass calibration please remove keys, watch, metal frame glasses, coins, etc. Then move away from any metal objects like cars, and then do the calibration. Thank you and fly safe always.