I've had some small cracks in the base of the Phantom's arms where the motor attaches. I have used the motor reinforcement plates on them for a few weeks. I can now report that they don't seem to work. I just checked the Phantom and one o the arms is cracked almost all the way. I'll post pictures later but I am going to try and contact DJI again to get a replacement. They didn't answer the first time so we'll see.