Hi,
We see the following in the logs.
2013-08-10T21:47:27.474Z| vmx| W110: ObtainHardwareID unexpected failure: 22.
2013-08-10T21:47:27.474Z| vmx| W110: Hostinfo_MachineID ObtainHardwareID failure (Invalid argument); providing default.
2013-08-10T21:47:31.707Z| vcpu-0| I120: CPU reset: hard (mode 2) // user or API initiated request to reset a virtual machine generates this event
2013-08-10T21:47:32.573Z| vcpu-1| I120: CPU reset: soft (mode 2) // Guest OS initiated reset generates this event
2013-08-10T21:47:32.578Z| vcpu-2| I120: CPU reset: soft (mode 2)
2013-08-10T21:47:32.581Z| vcpu-3| I120: CPU reset: soft (mode 2)
2013-08-10T21:53:25.404Z| vcpu-0| I120: PIIX4: PM Soft Off. Good-bye. // Guest OS initiated halt generates the following event
Seems that reset is being called by the API or user..!!
Check the windows event log for any 6008 event ID on the same time stamp to see if it was a forced shutdown.. If so try to find any event ID's that let to the possible force shutdown event ID.