In the last few months, my computer has started rebooting seemingly at random. It cuts out instantly, as if I'd pressed the reset button, and boots up as normal. There are no common traits I can identify; sometimes it happens in games, sometimes in applications, sometimes just at the desktop with nothing demanding happening at all. There is no indication of updates, installations, electrical anomalies or temperature spikes that coincide with the reboots, nor are there any BSODs or dump files to be found.
The Event Viewer is singularly unhelpful; I get criticals from Kernel-Power that "The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly." (Event ID 41, Critical, category 63, keywords (70368744177664),(2)) These messages are typically timestamped about 15 seconds before the log time of the reboot.
On the subsequent restart I'll get an error from EventLog that "The previous system shutdown at was unexpected." (Event ID 6008, Error, no category, keywords Classic) There will also be an information event from Kernel-Boot that "The last shutdown's success status was false. The last boot's success status was true."
My computer runs Win 10 (64-bit), with an Asus Z370-P, an Intel 8700 running at 3.20 GHz, 16 GB of Corsair RAM, and a GeForce GTX 960.
I've tried using Performance Monitor and various other systems to look for the usual signs of instability, but without luck. I'd rather avoid having to rebuild the whole system if at all possible.