Disney World always keeps its rides up to date and working properly to ensure a great guest experience.
Disney will often close rides to do refurbishments for routine maintenance, or sometimes rides won’t even have to close down for the Imagineers to make small adjustments. Depending on the maintenance, refurbishments can take less than a day to do or over a year (as will be the case with Big Thunder Mountain Railroad). A new permit that we spotted for another Magic Kingdom ride hints that maintenance of some kind is coming soon.