So I have had my phantom for about a month now and I haven't really had to many problems. Yesterday I flew on a battery and was a great flight, but when I put the next battery in, one of the motors was all jittery and not spinning fast. I also noticed that the red lights for that arm were not on. I took it apart and there was nothing wrong with it to what I could see. I am really confused because I didn't crash it or do anything and the motor won't spin properly. Any kind of help would be greatly appreciated. P.S. The first day I had my phantom it did this same thing, but I found an extra E-clip inside on of the motors stuck to the magnets. I don't know if did anything to the motor or even if it was the motor that is bad, but just thought i would share that!