hi, open the motor up and check the rotor , it may be chipped or cracked , more likely though is the motor has been run in wet filthy conditions and has never had the bearings oiled , once you have the rotor out you will be able to inspect and check the bearings indavidually ,
word of warning , when reinserting the rotor make a tube of thin card or thick paper and put that into the motor can then slide the rotor in , there are a few vids on youtube on how to strip and clean BL motors,
all the best
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