Atom Motion motors work inconsistently
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I'm noticing that even with the example sketch (https://github.com/m5stack/M5Atom/tree/master/examples/ATOM_BASE/ATOM_Motion) the two motors (pins M1, M2) turn inconsistently. Sometimes a positive speed (+100) will result in motion, and likewise with a negative speed (-100). But just as often the write will result in a high-pitched tone from the motor, but no motion. Writing zero always stops both motors. Has anyone else experienced this, and can you offer any insight/ideas?