That's not good @Kimmydaminx
My partner and daughter both use that phone and updated to the Android 11 and Samsung One Ui 3.0 update and don't have these issues !
May I ask what you have tried thus far in the way of troubleshooting ?
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.