In the lower-left corner of your screen, next to the Windows Start button is the spyglass (used for searches).

Please click on it.

In the search box, enter "Power & Sleep Settings", and then select the one marked Power & Sleep Settings.


Make sure that the settings under "When plugged in, turn off after" and "When Plugged in, PC goes to sleep after
are both set to "Never".

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Once those are set, please click the "X" in the upper right corner, to close the window.