My Windows 10 machine (Athlon X4-640, 8GB, AMD 780G chipset) reboots spontaneously every 2 or 3 days. It usually happens when I'm surfing in Firefox but not always. Not sure where in Event Viewer I should look to see if I can figure it out. When I look at critical events I see a kernal power (event ID 41) but all that says is "The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly" which really doesn't tell me much. I have run Memtest86 and got no errors. This was a clean install back in August and has probably happened 25 times since then. It wouldn't be quite as annoying if it booted quickly but I've got a PCI USB3.0 card installed which added about 60 seconds to the boot time.
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