I have exactly the same issue!
Ive actually been meaning to look into this for months, and just came on the forums tonight to see if anyone else had a similar issue. Ive got the same issue, but only on one side.
Anyone work out the issue?
My own investigations haven't been that advanced yet, and without putting an oscilloscope on the output of the driver output, I thought it could simply be a bad capacitor or drive MOSFET. The MOSFET idea seems like the most likely to me, as it feels like its missing a "pulse" to the motor. That explains why on higher speeds its less noticeable, since the pulses are so short.
Failing this, my last resort would be buying another main-board and to desolder and swap the chips so the new board all stays coded to the rest of the system.
I also noticed that letting it sit for a week or two, on the first run it works for about 10-15 minutes before the issue starts to occur again.
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