Universal Epic Universe ride reliability

1. 1Mine-Cart Madness™4d 7h lost · 88 breakdowns · down on 54 of 60 days 82.4%
2. 2Fyre Drill2d 17h lost · 44 breakdowns · down on 49 of 60 days 88.7%
3. 3Harry Potter and the Battle at the Ministry™2d 15h lost · 135 breakdowns · down on 56 of 60 days 89.3%
4. 4Hiccup's Wing Gliders2d 9h lost · 54 breakdowns · down on 53 of 60 days 90.3%
5. 5Stardust Racers2d 7h lost · 59 breakdowns · down on 47 of 60 days 90.6%
6. 6Curse of the Werewolf1d 15h lost · 42 breakdowns · down on 47 of 60 days 93.5%
7. 7Mario Kart™: Bowser's Challenge1d 6h lost · 52 breakdowns · down on 41 of 60 days 94.8%
8. 8Monsters Unchained: The Frankenstein Experiment1d 2h lost · 21 breakdowns · down on 45 of 60 days 95.5%
9. 9Meet Toothless and Friends1d 1h lost · 5 breakdowns · down on 15 of 60 days 95.6%
10. 10Yoshi's Adventure™23h 52m lost · 27 breakdowns · down on 27 of 60 days 96%
11. 11Constellation Carousel22h 50m lost · 20 breakdowns · down on 42 of 60 days 96.2%
12. 12Dragon Racer's Rally19h 52m lost · 17 breakdowns · down on 16 of 60 days 96.7%
13. 13Bowser Jr. Challenge21m lost · 0 breakdowns · down on 4 of 60 days 99.9%

Breakdowns cluster at 1pm, with 76 of the 538 closures that started before the park's final hour beginning then - so the ride you most want is safest earlier in the day, not saved for last. A further 96 rides simply were not running at opening, which is a late start rather than a fault and is counted separately. The other 26 closures start in the 7pm hour, when the park is shutting - those are rides finishing their day, not failing, so they are left out here.

The worst day in this window was 14 Sept, when 19.8% of the park's ride hours were lost and 10 of 13 rides went down at some point.