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I checked the settings to make sure it is on "never" sleep or shutdown when unattended. I have used the computer without any issues, however, I usually leave the computer on at night, and a couple of times in the morning the computer is off for no apparent reason.
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I have a desktop PC that I build a couple of year ago, Initially I had windows 7 until last week when I updated to win 8.1. I hope someone here can give some advice.
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