Thank you I guess I should have said when the motors are running & not spinning by hand will try ESCStops over and over? If you are spinning by hand Installing the prop should make no difference. Are you sure you aren't just feeling the motor cogging (slight resistance as the fixed magnets on the rotor move past the field coils? It is possible a bearing has failed allowing mechanical interference. If this is the case the motor will have axial play and possibly end float that will be obvious when manually manipulated. It is likely only the motor will need replacing.
If the issue is when powered it may be an ESC issue or younhave dropped a phase in the motor. I would replace the ESC first in these circumstances as the most likely culprit.
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