@Non Nerd : Maybe it is a DELL problem (but only because they happen to be the only vendor of the currently suspected item). We can't be sure yet, but they agree enough to send me some new hardware - an "E-Port+" Docking Station. This problem appears to
be from more from one cause based on the posts here and elsewhere, so your mileage may vary.
After some detailed testing I determined that in this case
the laptop dock may be at fault. After resetting the "Active Probing" registry setting and restarting the laptop while NOT in the docking station, you can use it and shutdown or restart (repeatedly) without the problem reappearing PROVIDED you do not
have it in the docking station. This was done with wireless (where the problem only appeared when in the troubleshooting process and hasn't reappeared again) on and off, with and without the Ethernet cable directly attached to the laptop connector, and the
power cord connected or not connected directly to the laptop.
HOWEVER, if you place the laptop in the docking station and shutdown and power on, or restart just once, the problem reappears. The docking station connections are made using the same cables as those used when direct connected.
Since the "docking station" is merely a "pass-thru" for connections according to Dell, the problem
in this case may be because there is either a fault in the dock, the dock connector or the laptop hardware.
I have another idea that may have to be explored: In this case the user has 2 displayport or HDMI ( can't remember which right now ) connected monitors attached to the dock. Of the three units of this model I have in use this is the only one with that config.
(The other two systems "seldom" and never have this problem, respectively.)
I'll keep you posted.