Quote Originally Posted by Alan Lung View Post
I think the reason it shuts down rather than restarts is because of BitLocker. No cnut is available to put in the BitLocker PIN so it gives up and shuts down.
Now you never mentioned having bitlocker active

Yes you have about 30 seconds from start up to type the key in. Or it shuts down.

Try this setting

Settings / Windows Update / Advanced Options

Turn on 'Notify me when a restart is required to finish updating' and that may stop it restarting automatically and the PC may stay on until you choose to restart.