It is down to one of the phases not working correctly which means the motor cannot self start but will carry on running once going and could be one of the following:
Poor connection down to weak connector or bad solder joint. An overheating motor/ESC can weaken solder joints.
Damaged ESC - try a different ESC to test - any make will do
Damaged Motor - try a different motor to test - any make will do
Damaged Sensor unit - you can only swap out if you have another SP motor sensor
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