Is it on an Asus motherboard, and did you install any of their utilities?
You could try disabling the service and seeing if the problem goes away (or if disabling it breaks your system). The problem may not even be that process. Are the event times about the same times that the machine shuts down?
Did you guys get any further on this? Cus im having the same problem now. Several reboots a day. Always when im playing games. I get the same "The ASDiskUnlocker service has reported an invalid current state 11."
The games are not installed on the drives that disk unlocker gives unlocks for me. Running windows 8.