I was getting this 4 months back and it was the same mobo - turned out pretty clearly to be overheating CPU. What happens is while your in the middle of regular computing, it switches off completely as though there was a short circuit and it was done for safety. However at times, it didn't happen - times where I had the side case off with a table fan blowing.
I'd follow their ^ advice and get the paste, a heatsink and a fan.
You might even like th look of it:
Zalman 7000B-Cu LED CPU Cooler Review
Quote:
- Dimensions : 109 (L) x 109 (W) x 62 (H) mm
- Weight : 755g
- Base Material : Pure Copper
- Dissipation Area : 3,154 cm2
- Bearing Type : 2-Ball
- Speed : 1,350 ~ 2,600 rpm ”¾ 10%
- Thermal Resistance : 0.27 ~ 0.20 ”ĘC/W
- Noise Level : 18.0 ~ 27.5 dB ”¾ 10%
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Thats the LED version of it BTW