Boot into BIOS (del during POST).. go into Hardware Monitor section and watch the temperatures. If you see a it climbing fast, turn it off and check your CPU/HS combo. Unfortunately, it sounds like a CPU/RAM heat problem from what you describe. Check that there isnt any dust in the CPU HS, etc..
You're fortunate because it sounds like your CPU/MB has a heat-protection mechanism that turns off the computer when a threshold is reached, rather than overheating. Watch those temperatures in BIOS and inspect all the fans as necessary.
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