1 Hard landing and motor magnets can be damaged. Whats to say this damage hasn't been caused by use?
If the motor has worked fine for 3 months then developed a fault it sounds as tho it has been damaged in use.
1 more thing to check is that the endbell is fully insulated ad not shorting out. I have seen a few people have this problem and it makes the motors run very hot and not perform well.
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