when setting up a fingerprint, initially you were required to setup a pin, pattern, or password. that is normal behavior that it asks for a pin sometimes
The only condition that I know can cause this condition is that powering off the phone. I did not bbn power of my phone.
that's where you're wrong, it will sometimes ask you to confirm your identity with something besides your fingerprint... get used to it.
My suspicion is something may be attempting to sign into my Samsung galaxy.
I feel you man, **bleep** thing keeps asking me to put the PIN instead of taking my fingerprint, after I've not used it for a long time. Each day I use this phone, my hate for it keeps growing. I'm moving back to Apple now, screw androids.