As far as I know, this is normal behavior if the OW is on rough ground at very low speed. For example, my lawn is bumpy and I when I tried to ride there on day one I got this motor stall error when my OW (+XR) rolled to the bottom of a divot and didn't have enough torque to climb out. No issues on pavement. Very rarely I have gotten the error when reversing direction on pavement. Never at speed, and in 190 miles I've had no high speed nose dives. I'm a heavier rider, at 230 lbs, which may be contributing to the motor stall.