I had a couple little hickups today. I set my P2V+ down in some thick grass. The props ate the grass up pretty good. Took like 15 minutes to clean the shell off with alcohol swabs. Briefly had a "gimble motor is blocked" message, but that went away. I don't know why, as I didn't do anything. Gimble seems fine and works. My son, Shane was flying the Phantom after that. He hit a rock upon landing and the bird flipped over and the motors automagically shut off. The props have really been taking a beating today. When should they be replaced? They don't appear damaged, and the quad flies.