- Check the punch and timing settings are neutral.
- Check if the rotor is binding for any reason (angular misalignment, bent motor shaft, too little space between the bearings).
- Check if there are any connections that may increase resistance somewhere in the electronic circuit.
- Look back into it's history: How old is it, how many times has it become hot and exactly how hot? Neodynium magnets start to permanently lose their magnetic capacity above 80 degrees centigrade. I don't know if that has an effect on power consumption (I'm no expert with electronics), but I'd say it can't help the motor's efficiency.
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