i've found crash logs, how do i post them here?
You could paste a link to something like pastebin, or just copy-paste the log and surround it in "Spoiler" tags.
But there is definitely an issue with your PC. A restart means that some part of your config is crashing Windows. Most often, that's due to heat, as
@devivre mentions above. Borked drivers for your GPU can also be a culprit. A Windows Update could have introduced an issue (quite common if you
upgraded to a new OS, as opposed to wiping your drives and doing a clean install of Windows.)
A game will only crash back to Windows if there's a bug or something. A hard-crash, hang, or system restart with error logs is usually caused by the driver / firmware / OS. A system restart without error-logs or a complete power-down will almost invariably be a hardware issue.