For those that are stating that YOLO is "broken down" because it is "stuck in the tunnel" (I really haven't seen any confirmation of this for one...), the tunnel is a stop point part of the safety features on the ride. It stopped running on the Midnight Riders thing as well and the lead mechanic explained to me that if the train going though the tunnel doesn't hit the trip points just right when going through, the whole ride automatically shuts down as a safety precaution. This makes it so they whole system has to reset and that takes time. The train doesn't just "get stuck" in the tunnel.
I think it might be something else if the ride isn't running.
That being said, I haven't heard much about the ride doing roll backs since the midnight riders event (When I rode it rolled back right before my train was to come around, followed by my train rolling back). I heard of a few times since then that had to do with it over heating, but it sounds like they might have solved it.