Could try standard fixes such as hard/soft reset, Boot into safe Mode and wipe cache partition. However some issues may well likely require firmware update. Article on reported issues here https://www.androidauthority.com/samsung-galaxy-note-20-problems
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .