UPDATE: So, I've narrowed it down to a bug with Developer Options being enabled. Upon disabling Developer Options and rebooting, the fingerprint option in biometrics reappeared and all of my previously stored fingerprints were still intact.
I'm not sure what Developer Options has to do with the fingerprint sensor, but it's definitely related to this issue. How Developer Options is apparently "killing" the sensor by cutting the voltage to it, rendering it unresponsive, I have no idea. Samsung: the ball is in your court now to debug and figure out what's going on!
I feel like this may be related to updates I installed, so I'm curious if anyone else is going through this, too.
This is my second Plus in two weeks, first exchanged for the same problem. That device was also fully updated.
Literally the same "failures" as my last Plus.
I have auto restart turned on so the phone restarts itself twice a week overnight while laying at my bedside. It worked fine when I went to bed, but when I woke up and unlocked it after it had restarted, the in display scanner no longer worked.
Surely the hardware hasn't simply spontaneously failed yet again, and it is just one of the recent updates that broke it... Thoughts/experiences?
The "failure" automatically removes all of my fingerprint biometrics on its own - they're no longer shown in the biometrics options menu.
When I click the option to add new fingerprints, that's where I get the "not responding" message shown in the OP.
On this second device, I wiped the cache before and after the updates. I have also tried wiping it since the issue appeared. The issue persists.
I appreciate the reply; however, Frija can't locate firmware for my version it seems, despite the model number and CSC being input.
As for the factory reset, I did that with my first Plus and it worked for maybe a day or so before the fault returned. I'm not inclined to go through all of that again if I can just exchange it with my carrier.