Try grabbing the dell diagnostics, set it to run unattended overnight, if it stays on, something in your OS is shutting it down. If it still turns off, you may have a hardware issue or environmental issue. I once heard of a place that had a similar issue as yours, they threw parts and a whole system at it, same issue. Turns out the cleaning lady would unplug the server to plug in her vacuum cleaner at night!
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