Haven't see said issue with this update, but I'd make sure your system is in a stable state.
Run the following from an elevated command prompt or powershell and make sure it does not detect any problems
SFC /SCANNOW
I would also run a check on the disk
chkdsk /scan
If any issues are reported then run chkdsk /F and reboot
As to diagnosing the issue start by reviewing the System log after launching eventvwr and filter on the User32 event source these events should tell you what restarted the computer. It is possible that it's actually crashing vs a controlled reboot, so you'd need to examine C:\Windows\minidump to see if there are any dump files that with timestamps that correspond with when the reboots occurred