okay so ive been fighting this for about three weeks and im at the point where im ready to throw the whole thing in a lake. running a dji rs3 pro on a fairly heavy hex build, total takeoff weight is around 4.8kg. everything is balanced correctly, ive gone through the balancing procedure probably six times at this point, and for the first minute or two of any given flight the gimbal works perfectly.

then at some point, usually when i do any kind of aggressive yaw or if theres any wind, the tilt axis just slowly creeps downward until its basically pointing at the ground and then the gimbal seems to lock up and stop responding to the joystick. if i land and restart the gimbal it comes back fine but then does it again.

at first i thought it was a balance issue but ive ruled that out i think. my next guess is either a motor overheating on the tilt axis or maybe some kind of vibration problem causing the imu to freak out. the hex does have some vibes in a certain rpm range that i havent fully sorted yet. anyone dealt with this kind of thing on a large setup

vibrations are almost certainly your culprit here. the rs3 pro has pretty sensitive imu and if its picking up resonant frequencies from your motors it can absolutely cause the kind of behavior youre describing - the gimbal basically fights itself trying to correct for what it thinks is attitude error and eventually the motor saturates and gives up. i had something similar on a octocopter build and it was maddening.

what kind of vibration damping mount are you using between the gimbal and the frame? if youre just bolted directly thats probably the problem right there. also worth pulling blackbox or the dji assistant logs and looking at the imu data during one of those failure moments, you might see exactly when it goes wrong. the rpm range thing you mentioned is a big red flag, id sort that out first honestly before doing anything else

not sure about the technical side of it but i know the rs3 has a motor protection mode that kicks in if it thinks its being overloaded - might be worth looking in the app settings to see if theres anything in there about motor protection or overload thresholds. also what firmware version are you on, there were some weird gimbal behavior bugs in a couple versions a while back