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While your power supply unit IS weak for the system you have it to power, one cannot interpret its performance by the voltage readings of the motherboard at a single moment of time. If they won't fluctuate, the system should work perfectly, but the motherboard sensors fail to catch fast fluctuations and one cannot tell without a fast multimeter connected directly to the unit. Their +/- 5% tolerance is already bad enough...
Perhaps you want to run something like Memtest or Prime95 for several hours and see if they give you any errors? It could be a software problem too, from all that I can guess.
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