Boot into Safe Mode and see if the problem presists. If it does not then it is one of the apps you've added that is causing the issue,
If it still freezes in Safe Mode then I would do a Factory Reset without restoring the backup. If it still does it after the Factory Reset then you will probably need to open a ticket for repair.
Galaxy S21 Ultra 512g(VZW), Galaxy Book (original, VZW), Tab S4, Galaxy Watch3 (VZW)