I have a Dell Latitude 6430 ultrabook. I close the lid at night which goes into sleep mode. Upon opening lid screen is black and power is on but have to force a reboot. Looking at the windows 7-64 pro event log there is a critical error -
Event filter with query "SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA "Win32_Processor" AND TargetInstance.LoadPercentage > 99" could not be reactivated in namespace "//./root/CIMV2" because of error 0x80041003. Events cannot be delivered through this filter until the problem is corrected.
Not sure if this is related to the freeze up but need a fix.