I have an unexpected reboot into which I am trying to find the reason.
When it started, the Event Viewer has a few red flags:
The previous system shutdown at 6:10:59 AM on 5/19/2018 was unexpected.
The computer has rebooted from a bugcheck. The bugcheck was: 0x000000c5 (0x00000000760e0002, 0x0000000000000002, 0x0000000000000000, 0xfffff800edd49740). A dump was saved in: C:\WINDOWS\MEMORY.DMP. Report Id: 9a6c24a9-851c-43ec-8c65-1750be15c188.
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
To me, this does not appear to have been triggered from a Windows updates.