this has been bugging me for a while and i keep putting off fixing it. one of my rear motors ? M3 i think ? will occasionally desync after a really aggressive roll and the quad just drops for a split second before recovering. its not consistent enough to crash me but its definitely there if i look at the blackbox logs you can see the motor output spike weird.

replaced the props already, checked the motor screws, ran the motor test in betaflight and it sounds fine on the bench. my gut says its a cold solder joint on the ESC pad but i also read somewhere that desync can be a settings thing in RPM filter or something. running BLHeli_32 on a Aikon AIO if that matters. anyone dealt with this before

check your motor timing and demag strength in BLHeliSuite first before you go poking at the solder joints. desync on hard maneuvers is often timing related especially if the motor is slightly under-powered for the prop combo youre running. try bumping motor timing up one step and see if it changes anything. if it keeps happening after that then yeah pull the motor leads and reflow them, cold joints on ESC pads are super common and theyll pass a bench test all day long but fail under vibration and load.

had almost exactly this issue on my 4inch build last year. turned out to be a combination of things ? the solder joint WAS slightly cold but also i had a tiny nick in the motor wire insulation where it rubbed the frame and was basically intermittently grounding under flex. worth checking the wire routing carefully especially near any sharp frame edges. learned that the hard way after reflowing the pads twice and still getting the same dropout