Since the latest system ui update my phone chimes 3-4 times in the middle night with no visible notification.  When I look at notification history there are hundreds from System UI.  I have do not disturb on, I have all notifications silenced that can be.  I cannot silence my phone because I need to receive text and calls.  No matter what I do I cannot silence these notifiations.  Almost all the options to stop system ui notifications are greyed out and it has permission to override my do not disturb and it is also greyed out.  Any help would be appreciated.