Hi I encountered the same issue on Windows 8.1.
So far it went away after I re install the os and setup both drives as gpt partitioning during os installation process (press shift + f10 and run diskpart, select disk, clean, set as gpt ). Next I installed all drivers and so far didn't reappear.
Can you ask your friend to give some more information such as os used, happen after os update, reinstall, etc
On other forum most people can resolve by Disabling fast start up under power options in control panel (Google up windows 8 hang during restart for exact procedure to do it)