Anyone else having this issue? Just started a couple of days ago. No event that could have triggered it (e.g. new app, physical damage).
Phone started powering off randomly after going to Always On Display. Did some research online and found the cause seems to be related to fingerprint unlock. Disabled that, and now anytime I try to enable it, the phone immediately powers down. If I use Samsung Pass to autofill, it powers down immediately.
Try this - Settings - Three Dot Menu Top Right - Show System Apps - Search for Biometrics - Storage & Clear Cache & Data for Biometrics. You could also try removing your Finger Prints & Register them again 🐧