Weird crash while performing Autotune

Hello Guys! I have been testing a PixHawk 2.4.8 and I tuned it perfectly and it was not oscillating at all and when I tried to perform an Autotune it crashed. When I checked the Drone one motor was out of its place and the other parts were fine after the crash. I dont have any log files because Autopilot is not logging. Anyways have you evet experienced something like that motor just jumps out of it place and Drone crashes . Thanks