Originally Posted by
lomapaseo
It's not clear from some fuzzy pictures that all screws backed out. Some could have simply had their heads popped off from vibration. It happens to rivets like that.
From the somewhat-fuzzy photo I showed earlier in this thread, it looks as though the head of the top left screw simply pulled through the panel - causing the hole to become enlarged. The next hole over is also enlarged, but not as much - so maybe that was one where the head of the screw was worn off. The other holes are smaller - consistent with screws vibrating loose.
So it would not appear that they all vibrated loose at the same time. What we see is consistent with the problem working its way to the top left of the panel. Then with only two screws left holding the panel, vibration was no longer an issue - one wore/sheered away from motion and the other just tore free.
I'm not saying that this is what happen, but it is a plausible scenario.