I agree with Jason. My understanding of motor/ESC electronics is incomplete but loss of commutation can lead to multiple types of failure in the motor or ESC. One can have a bad solder joint at the motor,bad solder joints at the connectors or bad solder joints at the ESC. Once one of those three wires has increased resistance compared to the others, the ESC and motor cant talk to each other accurately and some type of failure is imminent. I'd enjoy if a more knowledgeable person would expound on this further.
I would also check the pinion gear in the contra unit. I've had two strip on V3 units, one after a prop strike, another when my Neu siezed...none so far on my V4. If the pinion gear strips in flight the props stop or free spin and your aircraft's glide ratio assumes that of a brick.