This is going to make you scratch your headFirst try and see if that propeller is not pushed down to much against the motor housing. I sometimes find that to be my problem. Just lift it up a little bit, so that it doesnt rub against the housing. If that doesnt work, it could be a problem with that said motor.
Looking closely at the propeller shafts on both of my Tellos, it is not possible for the prop to touch the motor housing.First try and see if that propeller is not pushed down to much against the motor housing.
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