After one crash with my new e-flite 4100kv motor installed it stopped working. All it would do is just chatter back and forth. I called e-flite and they said they can't warranty crash damage. I took the motor apart and found the very large magnet inside chipped a big edge off. $50 on one crash. i'm very disappointed. My rim fire outboard has taken many crashes even on pavement with no problems. What to do?