so ive been running a Gremsy T3V3 with a Sony a7III for about 6 months now on a heavy lift hex and for the most part its been solid but lately ive been getting this slow drift on the roll axis, like it'll just slowly tilt maybe 2-3 degrees over the course of a flight and i have to recalibrate mid-mission which obviously isnt ideal when youre trying to get clean footage

i already went through the PID tuning again and reflashed the firmware last week, didnt really help. the motors feel fine, no obvious play in the arm joints. i thought maybe it was a balance issue with the camera but ive triple checked the CG and its pretty much spot on

wondering if anyone has seen this with the T3V3 specifically or if this is just a gremsy thing in general. also running it on a Herelink so i dont know if theres some kind of interference thing happening but that seems like a stretch

had something similar on my T1 a while back. turned out to be a loose encoder ribbon cable inside the roll motor housing, wasnt obvious at all from the outside. the gimbal would hold fine at first but as it warmed up the connection would get flaky and you'd start seeing drift. worth pulling it apart and checking the connections if you havent already

also worth checking if the drift correlates with motor heat - if it gets worse as the flight goes on thats a decent sign its thermal related

not a T3 user but i did have drift issues on a different gimbal and it turned out my vibration damping was too soft, the whole gimbal was getting micro-oscillations from the props that the IMU was trying to compensate for and just... slowly losing the plot. switched to slightly stiffer dampers and it basically went away. might not be your issue but worth a look at what youre mounting it on