Originally Posted by TheStnchOfSpeed
Maybe the rotor is what I am talking about. I am not that familiar with brushless nomenclature. The shaft will walk out of the motor while it is running.
How far? If it just has play back and forth a mm or two, that is normal. If the shaft can literally walk all the way out, then your shaft has separated from the magnet... rotor is toast. Make sure don't free rev your motor with no load.