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How many machines are actually exhibiting this problem? Considering the machines are at different locations, with different networks, can actually increase your odds of having simultaneous hardware problems. Simple laws of probability.
You should give the machines a thorough scan for viruses and spyware. Did the IT department, or the users, install something recently that might have disrupted the system? You know, Mary at the office emails this cute little proggy of a cat that runs around the screen while you work. Next thing you know it's on 5 computers.
I would still check the hardware: RAM, overheating, and power.
I've had sudden hardware failures that just seem impossible to believe, but they were legit. In fact, I've had a few network cables in my office just fritz out. Worked one minute, dead/flaky the next. CPU fans get weak and the processor burns out. Etc.
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