I agree with @Ashgreentint that may turn out just to be a glitch which can happen with technology @Martin83
If it happens again then you can then look at various reset options and or let a Samsung Experience Store or Samsung Service Centre take a look. 😃
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "
