Hi,
Welcome to Microsoft Q&A.
Is there event ID 1001/6008 in the system event log? Is there a Bluse Screen when this issue happens?
Usually, unexplained reboots are caused by the following.
Unstable hardware devices, expired device drivers, interference from three-party programs, and system abnormalities.
Has any special operation been done during this time? For example, certain drivers were installed, certain patches were updated/certain software was installed. It is recommended that you can undo the previous changes step by step.
It is also necessary to exclude that the reboot was caused by a driver or a patch/application.
Best regards,
Molly
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