Go into BIOS settings on boot, and check the thermal temps.
What temp you reaching at idle?
This is lowest; when the pc is under load the temp will rise. If it rises to high it hits the threshold and it will shutoff.
You should see the mb/case temp in BIOS too.
As the weather warms up; some PC's just get too warm?
Other than that; installed any updates or software/drivers just before it started shutting off?
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