That's not good @DannyG6 !
If a soft reboot by turning your phone Off.
Remove any relevant sd card.
Hook upto a computer and try using Samsung Smartswitch to see if that kick starts it.
If you do get into it put it into Safe Mode which disables your downloaded app's but let's your stock app's keep working. If the issues stop then this highlights a downloaded app as the possible issue. Come out of Safe Mode and start deleting your most recent downloaded app's one at a time until it stops.
and if that does not help then you may have to try a hard reset however this has the potential to delete any saved data in the phone.
Most Samsung Experience Stores and Samsung Service Centres are closed due to the pandemic but if available where you live you could try a doorstep Samsung repair service option.
I wish you all the best with this.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.