Mike, I think you may have responded to a different post
The shutdowns are not random, but occur at or during sleep mode.
One example of an issue that might cause this would be that hybrid sleep mode or hibernation was enabled, and not compatible with the SSD.
A BIOS update might also help. I see on the list several recent improvements that might effect this issue:http://www.asrock.com/mb/overview.us.asp?cat=Download&os=BIOS&Model=Z77%20Extreme4