Now the issue: Midflight my mavic lost all 18 satellites. After landing, I was asked to perform the IMU calibration. The calibration does not finish and crashes in between. I get a "Calibration error -13". Now the aircraft cannot start. I tried in many different places many times, also changed the connecting cable.
Before that I had one month of fun flying my used Mavic 2 Pro.

I would appreciate any help. Thanks and best regards from Germany

Hello there Medini. I am sorry for the trouble this has caused and thank you for reaching out. Kindly please try to power off the said DJI drone and leave it for about half an hour, then restart the drone and calibrate the IMU once again. If the same error persists, I would recommend for you to contact our DJI support team at https://www.dji.com/support for further assistance. We have a team that will do there best to check the said DJI drone and give out the best resolution for this issue. Again I am sorry for this trouble and thank you.