If the regulated stitch speed is not optimized, but too high, the motor will heat up considerably. While the higher heat will not damage the motor, it will weaken its magnetic field, which will result in needle position overruns. Instead of changing the needle positions, reduce the needle positioning speed, when this happens. Remember that the motor heating can be reduced by using the Precision Mode for all, but high speed patterns with a lot of points. If you want to use the high speed regulated mode often, please optimize the regulated speed setting.