Suspect that WMI is crashing your SVCHOST? Run it standalone.

Mostly useful only for debugging situations but I'm trying to track down a strange ASP.NET crash on shutdown so this is helping the cause:

'RUNDLL32.EXE %Systemroot%\SYSTEM32\WBEM\WMISVC.DLL,MoveToAlone'

You will have to reboot your system for it to take effect.

Once you have narrowed down the problem, or fixed it, you can restore the default behavior by running:
'RUNDLL32.EXE %Systemroot%\SYSTEM32\WBEM\WMISVC.DLL,MoveToShared'

If you think WMI is seriously damaged, run WMIDIAG on it.

Missing, but registered SNMP DLLs ended up being my problem.