My fingerprint works great for a couple weeks but slowly becomes less reliable. After a handful months it drops to maybe 1 out of 5 times success to unlock my phone. If I delete the fingerprint and add it back, it kinda restarts the whole thing, but it seems like the period of it working decently degrades faster as the phone gets older.

But here’s the part that puzzles me. Notice I specifically said unlocking my phone? For some reason, it’s the only thing affected by this. All my banks, investing, MFA, and more, all those apps that need a fingerprint to use? Works almost every time the first try.

I experience all of this on my S23 Ultra, exactly as you’ve described it. And I also don’t use a screen protector.