I've been there while 3 (or maybe even all 4) theaters were running. The line went so fast that day! But that was only once out of the three times I've been in line for the ride.
Today though, I believe there was a fire alarm situation that has caused both rides to close temporarily. Since both rides share a single building they both had to close during the alarm.
Have we ever gotten any real confirmation that "overheating" is the issue? It could be something as innocent as a timing issue. One time I rode I had to wait for the ride system to cycle through entirely before we could begin. You could hear all of the music queues and everything without the screen running. There could be a lot of little things wrong, rather than one big flaw I'm thinking.
...Although, maybe the fire alarm was because of some severe overheating. Anyone have any news on the current situation over there? According to MDE both are still closed now.