CCleaner for Android:
Just in the last 24 hours sleep mode has stopped working completely. It goes through the process, saying that it's force-stopping apps, but then when you check they're all still running.
I'm subscribed to CCleaner Pro, have uninstalled and reinstalled the app, have restarted, powered off and powered on my phone. None of these things have helped.
I'm running Android version 13 on a Samsung Galaxy U22 Ultra that's using One UI 5.1. But, again, it has been working perfectly until today.