I did a factory reset
All caches are cleared
Samsung wasn't a phone builder from sunrise and at sunset, they're still struggling. These are just businessmen or women making the cheapest, cutest phones possible. These batteries were made over 5 years ago so the device has little or no battery life and a whole host of other complaints from espionage to unlawful conduct. Android is fine, samsung is crap!
The Li batteries are days or months old when assembled into the phone. They have a finite storage life because of self discharge. They are never fully charged before being shipped as it would degrade them faster during storage. A 70% or so charge is typical.
I actually purchased the phone with the Android OS 12. but I know it's just the One UI 4.0 not mapping onto the android OS as it should. I've been trying to unlock the boot-loader, trying to root, and downgrade to A OS 10 or even 11 to get it running stable.
Besides that, something weird happened. I got frustrated with the phone and put it in the case backward. It pressed all three buttons and the phone did this in the pic. It entered a mode requesting a Custom OS.
My final plan for this device is RiceDroid or another custom OS.
I have two stock N10+'s Snaps that were bought new. Both still running on the original firmware Pie and Q. The oldest in my hand is over 3 yo with well over 8k hours on it. It looks, feels and runs like new, zero display degradation. Only repair is a battery replacement. Last factory reset was over 2.5 years ago, it still running fast and stable. Samsung is capable of making high quality flagships if they want to. In my opinion the N10+ was the last great one they made; Samsung's zenith. Samsung's been dropping balls now for 3+ years. They've abandoned their loyal power user base completely.
One reason you buy a Samsung is for the UI. A custom rom will cause you to lose a slew of features and have numerous new issues. Android 12 is a known to be a mess. 13 doesn't impress me either. Google is trashing Android Apple bad. Now Samsung started following their lead by removing expandable storage.
Snapdragon's are notoriously hard or impossible to root so you may be stuck with 12. If so the bootloader version determines if you can roll it back. Most times the bootloader anti rollback prevents this. Those who upgraded to 12 from 11 can generally roll it back to 11. I doubt this is true with a new Samsung that was factory loaded with 12.
Call Samsung tech support and share the wuv, I do. If you do speak with them ream them out for no expandable storage as well as their other ongoing blunders. If I was in your position I be real pissed too...