This has happened a couple of times in the same save file now.
A skinny dipper leaves a cheap hot tub, only to disappear. She takes the cheap stereo on the hot tub as well. Her clothes are still on the ground. NRaas ErrorTrapper brings up a notification with an error code, then records it. Overwatcher’s alarm goes off later, and along with other stuff says “Sims reset: 1”. Is my hot tub broken or something (not in the way that sims could repair, BTW)? I’ve already reset it once, but will I have to buy it anew?