Even the machinery of time experiences wear and tear from use. Gears lose teeth, rust builds. Folks don’t often notice the minor grinding or a jump here or there, but sometimes a gear slips and you experience an extra day nobody else in your life passes through. Or you lose one.
The ones who should be maintaining the gears are gone, and everything decays. Did you forget that conversation, or did you skip over it? Did you blink and find your friends a decade older than you? How much longer can time pretend to lurch onward in this state?