Check your screensaver settings:
1. Press the Windows key + R and type the following in the Run box.
control desk.cpl,,@screensaver
2. Uncheck the option labeled "On resume, display logon screen".
3. Click Apply and OK.
If you want to delay the lock screen timeout, please refer to this method:
http://www.top-password.com/blog/change-lock-screen-timeout-in-windows-10-8/
Hopefully these will work for your case!
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