Space Mountain remained down at 3:55 p.m. EST Monday after more than three hours unavailable during Magic Kingdom's operating day.
The interruption began around 12:20 p.m. EST. A separate 15-minute interruption ran from noon to 12:15 p.m.
Magic Kingdom is scheduled to remain open until 10 p.m. EST Monday. Space Mountain was not listed as a planned closure, and no cause was identified.