Poweredge hangs on shutdown/restart after windows updates

We have about 20 or so poweredge servers of different generations, and are having a problem with servers not shutting down all the way when trying to reboot from windows updates patching.  The problem has been seen across 1900's, 2900's 2800's and 1800's.  All servers are fully patched every month from microsoft and we do a firmware/driver update round every 6 months.

When the server shuts down, if it hangs, no services, rdp, or remote server management (windows ) can be used.  DRAC still works fine, and using the remote console on the DRAC or looking at the server console physically shows a gray blank screen, and nothing else.  At that point the only way to shut the server down is to do it through the DRAC, or holding the power button down.

there does't seem to be a pattern as to which server will cause the issue, so it seems completely random to us.  Every windows update cycle, we experience at least one server that exhibits this behavior.

Has anyone ever seen/solved the problem?

--Chris