Computer shuts down after some minutes

[plutomaniac]

you don't need to overclock for the cpu to move from voltage to another. For instance, I had no problems when on 1.1 but when it moved to 1.4 it instantly increased temp.

I know that. But, when at stock (no overclock) it shouldn't matter what voltage it applies and when. It's all safe. And, as cpu voltage is concerned, 1.1 - 1.4 is a significant jump.