The Windows 10 may restart unexpectedly. In order to find out why you can execute the following command:

wevtutil qe System /q:"*[System[(EventID=41) or (EventID=1074) or (EventID=6008)]]" /c:1 /f:text /rd:true

If the case is Operating System: Service pack (Planned), set the following registry key to disable automatic Windows update restart:

HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU\NoAutoRebootWithLoggedOnUsers