Problem with temporary mute (opens in new tab)

Hey brain trust, My wife has an S25 and we're having problems with the temporary mute setting\. We'll set that for a time and it doesn't reliably revert back to the original ringer state\. Lately, it's been getting stuck on vibrate for some reason\. I've tested it for 10 minutes, 15 minutes, even two and a half hours, and it works, but then the next time she'll try using it for 15 minutes and it won't work\. She's tried setting it for three hours, and it won't work\. We cannot figure out a\.\...