Is this happening everywhere you go or in a particular area and is this happening with all calls @Fraut75 ?
You can use the diagnostic tool in your Samsung Members App under GetHelp too.
A Samsung Service Centre can check out the phone.
I wish you all the best.
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. "