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Paul, a couple of thoughts.
Does the motor cause a brownout that would upset the power supply and the stuff hung off it? You'd need something like an oscilloscope to pick up the transients.
Can you shield the motor and its cables? Why blame the USB if it's the motor's fault.
Your load on the power supply should be OK.
Running the motor from another power point might work, but off a different circuit would be better. If you have more than one phase, putting them on different ones would be even better.
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