I have the S21 Ultra and my sister has the S21 plus. After updating our phones, we have been having problems with phone calls dropping after a few seconds. My phone will sometimes will freeze then restart. This is extremely frustrating.
Maybe try battery reset the phone completely, not sure if you'd want to do that though if you have memory's on there, if you do, try going Into safe mode
Hi, trust me back up your device settings & do a factory reset, all your devices issues will be solved. Give it a try, I do it after every major update, works for me.
