I too am getting the stick err on startup. But I don't have the same issue with the left stick during calibration, and the error goes away after a minute of beeping or so. Calibrating hasn't solved it as some have suggested it might. Had my mavic for a few weeks. The stick error started on flight 3 or 4, and seems to be getting worse (error and beeping lasting longer each time).
same problem for me. After 5 flights, I get a "error stick" and this beeping, but it is not possible to calibrate. Time out all the time and the left stick behaves strange, off center and jerkily movements. How did you solve the problem??