On my Y6 with KDE 2814XF-515 motors and HW X-Rotor 40a ESC, Pixhawk, it seems like I have to re-calibrate the ESC's over time. Recently the motors were shaking pretty badly which was obvious when slow motion showed motor #5 definitely spinning odd and slower than the others. I calibrated the ESC's again, they it smoothed out nicely and thought that took care of it.
Now it sounds like they are starting to do it again.
This has occurred with every ESC tried. Could it be one or more motors are shorting or are these KDE motors are too fussy? I've had these on this copter since last November and had big problems with some ESC's. Then the HW X-Rotor appeared to have fixed the problem, but apparently not.
So what are the common causes for motors going out of sync?
Thanks.
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Anyone?