Sounds a bit like an overheat. I had this happen a lot to my dad's computer and interestingly it turned out to be the motherboard northbridge (rather than the CPU) overheating! Eventually solved it with a large fan suspended spiderman-like in the middle of the case over the NB heatsink.
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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