okay so this has been bugging me for like two weeks now. one of my motors was stuttering under load, not all the time but enough to cause twitching in rolls, checked blackbox and you can clearly see the one motor output spiking weird. so i replaced the motor with a known good one from my parts bin. same problem. exact same behavior on the same ESC corner.

im starting to think its the ESC but before i tear the whole stack apart i just want to make sure im not missing something obvious. the motor leads all look fine, resoldered the joints anyway just to be sure. the signal wire seems okay. i reflashed the ESC with blheli suite and the timing and settings all look normal compared to the other three.

running an all in one stack so replacing just the one ESC means replacing the whole thing which i really dont want to do right now. anyone run into this where it turned out to be something stupid i havent thought of?

have you checked the actual motor connectors for corrosion or any cold solder joints? i had something similar and it turned out one of the bullet connectors had a hairline crack inside that you couldnt see without actually pulling the connector apart. looked totally fine visually but was making intermittent contact. also worth checking if the phase wires have any nicks from a previous crash that might be causing a short under load

blackbox log would be really helpful here, what does the motor debug output actually show, is it the motor ramping weird or is the FC sending a weird signal to begin with. because if the FC output to that ESC pad is flaky youll see it regardless of what motor or ESC you put there. had a board once where one of the ESC signal traces on the FC was partially lifted and it caused exactly this kind of issue. not common but worth ruling out before you trash the whole stack