NIS GUI Inaccessible After PC Startup

Occasionally the NIS GUI is not accessible when I start up my computer in the morning.  Task Manager shows Norton running, but I can't access the program until I reboot the computer.  This has happened on a few occasions in the the last year or so, but recently it happened twice in two days.  I completely reinstalled NIS after uninstalling and using the Norton Removal Tool.  It happened again this morning and a reboot was required to access the GUI.

 

Here are some pertinent details:

 

Windows 8.1 64-bit PC, fully updated.

 

Norton Internet Security 21.3.0.12; Boot protection set to Normal.

 

Task Manager says NIS.exe and Uistub.exe are running, but when I click on my Norton shortcut nothing happens.

 

Clicking on Identity Safe 'Vault is Closed' opens a small 'System Restart Needed' notice.

 

When I reboot the computer and access the GUI, it says Live Update has run in the background during this GUI-inaccessible period.

 

Running Support both before and after these incidents does not find any issues with NIS.