Have well over a hundred flights with the phantom 2 and now the 3. Have never had a single issue. That just changed. After about 10 seconds after take off, 30' off the ground, a prop came right off (spun off, didn't break)....my drone crashed straight down, serious damage. I am more than a 100% sure I tightened the the props. I always spin them until the motor starts to spend too. Has anyone had this happen to them before?! Is this a known defect?