So I did a little research and found something interesting.
Day 2 of FoP, it was down 9% of the day. Same with day 3.
Day 2 of FEA, it was down 44% of the day. Day 3 it was 36% down.
I don't know the data, but we all know Hagrids had numerous reliability issues early on.
MF? Zero downtime since opening (at least through Saturday 8/31).
Maybe Disney's issue here is that they made a ride that is too reliable.
@lentesta reported that multiple simulators were out of service on Thursday and Friday.