okay so i crashed my mavic pretty hard a few months back and the gimbal ribbon cable got torn. replaced the ribbon myself, wasnt too bad actually, lots of guides online. but ever since i put it back together the horizon drifts to the left over like 30 seconds of flight. its maybe 3-4 degrees, not huge but super annoying for any kind of real footage.

ive done the gimbal calibration in the DJI app probably six times at this point. always on a flat surface, phone level checked it. sometimes right after calibration it looks perfect and then by the next day its drifted again. i dont know if i got a bad replacement cable or if i bumped something internally when i was in there. the gimbal roll motor does make a faint sound when it corrects, like a tiny whine, which it didnt do before the crash i think.

wondering if anyone has dealt with this or if im just looking at buying a whole gimbal assembly at this point

that whine from the roll motor is a red flag tbh. when gimbals drift like that after a repair its usually one of two things, either the IMU on the gimbal itself got damaged in the crash and the calibration isnt sticking because the sensor is giving bad readings, or the motor is just weak/damaged and cant hold position properly. ribbon cables are cheap to replace but if the crash knocked something loose on the gimbal board thats a different story. id try a full camera reset not just the gimbal cal, there should be an option in the DJI assistant software to reset the whole camera unit. if that doesnt fix it youre probably looking at a gimbal assembly replacement yeah

this is kind of off topic but i went through something similar and just ended up sending it to a DJI repair center. cost me like 80 bucks and they fixed things i didnt even know were wrong from the crash. sometimes the DIY route isnt worth the headache especially if internal sensors got messed up, thats not really something you can fix at home