Go to your start menu and in the search field type "power" or "sleep" - you should see power options listed as a search result.
Go there, look for a way to change your current power plan ("advanced power options")
When your computer is idle for X minutes, it shuts the monitor off
When your computer is idle for X minutes, it may stop power down the hard drives to save them from idle work.
When your computer is idle for X+X minutes, it goes to sleep
When your computer is idle for X+X+X minutes, it may go into hibernation
When the monitor is shut off, mouse movent or key press will bring it back
When computer is in sleep or hibernate, these states can be configured to allow wake by mouse/key or by power button.
Check these variables and change them INCLUDING the length of idle time before computer commits to one of these actions.
You can also tell it to NEVER sleep or hibernate, which may just solve your issue.
Illuminalto has definitely stated the correct answer.
at first, the computer just shuts off the monitor then it will go to sleep then it will hibernate.
just set the Power settings to never hibernate.
Great explanation, and I'd like to add my suggestion to it, which galabad71 mentioned.
If this is a custom-built desktop (as opposed to a pre-built), turn off any and all settings related to sleep and hibernate (and set counters to 0 which disables them). I've never had sleep or hibernate work well with custom PCs, there's always been some edge case which causes grief.
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