I realize this is a topic that is probably of little interest now that the P4P has been phased out, but did any other users notice that it's easy to not get the props on properly? I would always push them down and turn them, thinking they were properly in place. Then I would start up the drone only to have one of the props go flying. This could seemingly be an eye hazard, but fortunately they would always fly upward before coming down. Usually no harm done, but I lost one in the water. I finally learned that this problem can be avoided by trying to rotate the prop back and forth to verify that it's securely in place. I never had one fly off after starting to do that test.