OK I think I found it, I installed the Win SDK and used Windbg tool to view the minidump files:
DPC_WATCHDOG_VIOLATION (133)
The DPC watchdog detected a prolonged run time at an IRQL of DISPATCH_LEVEL
or above.
Arguments:
Arg1: 0000000000000001, The system cumulatively spent an extended period of time at
DISPATCH_LEVEL or above. The offending component can usually be
identified with a stack trace.
Arg2: 0000000000001e00, The watchdog period.
Arg3: 0000000000000000
Arg4: 0000000000000000
Debugging Details:
------------------
DPC_TIMEOUT_TYPE: DPC_QUEUE_EXECUTION_TIMEOUT_EXCEEDED
CUSTOMER_CRASH_COUNT: 1
DEFAULT_BUCKET_ID: WIN8_DRIVER_FAULT
BUGCHECK_STR: 0x133
PROCESS_NAME: networx.exe
CURRENT_IRQL: d
It looks like networx.exe is to blame? Can someone pls confirm this is the case? Thanks again!