This weekend I installed a clutch kit and found the staked nut that holds the clutch on was so loose I removed it with my fingers.
I've had the same issue but found the bolt.The bolt on the seat belt (passenger side) that attaches the belt to the roll bar popped out while bombing down a trail. Seat belt was under tension so the bolt got launched out into parts unknown, we couldn't find it. My wife used some binder twine to tie it back up. Dealer replaced the bolt but that was the last thing we thought would come loose. Bit of a QC issue in our minds.