Freewing F35 now 200+ flight

The stock motor completely lost power in air. Luckily, the BEC is stil functioning and land her safely. Opening the motor bay and find the motor extremely hot. The strong smell makes me think the motor or the ESC is burnt. Everthing is stock and nothing different from previous 200 flights.

The only think I found is the previous 2 packs are getting slow and I think the Lipo is bad. THe motor was found burnt and siezed. Post mortum will begin to see what cause the motor sieze. Bearing? Broken magnet?