I found there are silimilar post, but my freezing is abit different.
it happened a few times already, after windows 8 return from sleep just fine.
and within 1 minute of return from sleep (exact time I don't remember)
PC complete freeze, I am able to move the mouse but not click anything, keyboard don't work, the screen just show what was last seen on the screen nothing changes. and my HDD light gone solid.
it freezes about 15 seconds or so and then back to normal when HDD light goes off.
im running i7-930 on X58 board, and OCZ SSD as system drive.