It didn't crash at all. Found it during preflight, I heard a click of teeth slipping during powerup. Further investigation revealed no missing teeth but play in the gear shafts allowing the teeth to slip by each other...new servo installed, no further incident on test hover. I thought earlier I heard gear slip before but before I flew, I cycled the flight controls, it acted normal, if flew fine, so I've been flying it. When I powered up today...double clicks. I re-powered it a few times and the slippage got worse, so I just changed out the servo. Wind really picked up outside, so I won't be able to fly it out side today.