I think I might know the reason behind this. First off, shut the computer off but don't leave. See if you see the computer booting back up. If it does it right away, its most likely fast boot. I had a problem like this and the solution was simply to turn off fast boot. Try this http://acer-in.custhelp.com/app/answers/detail/a_id/37059/~/windows-10%3A-enable-or-disable-fast-startup. After you turned off fast boot try and shutdown the computer again and see if the problem persists.