I have a few motors from EXP classroom kits that have stopped working. I’ve tested with different cables and different brains and nothing helps. Sometimes the brain doesn’t detect that the motor is plugged in at all, other times, it does detect it, but the motor just doesn’t spin. The EXP kits are pretty new, so I don’t think theses motors have been used too much. Also, when students had the motors on a robot, they were unable to turn them even manually with a wheel on a shaft. I noticed a similar problem earlier in the school year and it seemed to get better when I switched to shorter screws to hold the motor onto the structure. I’m just wondering if this is a common problem and if there is a good solution.
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I think the best move considering the steps you’ve tried so far is to reach out to VEX Support. They’ll be a great source for further troubleshooting 
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