1st guess: Overheating - get a can of compressed air, turn off the machine, take it outside and blow the dust out of it. Make sure any fans (video card, CPU, power supply) are spinning freely.
2nd: Ram, try alternating/replacing.
3rd: Power supply - often overlooked but a frequent culprit in an unstable system.
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The silent truth asserts it's proof like you abhor.
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