Does anyone know if Hybrid Sleep is really the problem? If so, why? Per the tutorial, it is just saves files/states prior to sleep...

I am another Windows 7 user with a similar or same problem: this am I find my computer with the power light on but unresponsive, which has been happening ocassionally . When I power down, count to 10 & reboot, all seems OK, but I have the error "The previous system shutdown at 7:23:57 PM on ‎6/‎20/‎2015 was unexpected". I am rebooting at 08:33:18 AM 6/21.