Thanks Shawn. What got me thinking it was the CMOS battery was that I got the time/date error(s).
For the time being, I am going to keep runnng on the backup unit. The CMOS batteries should be here Mon. or Tues. Once I have a new battery, I will run through the first three points you listed. If none of those fix the problem, then I will swap system board.
A bit of history of these mk4s. Earlier this year I bought a lot of 38 CF-29LTQGZBM-B units. There were from the electrical utility company in Alberta. The majority of the units had spent most of their time in vehicle docks, but a few looked to be foreman/supervisor units. The daily driver I am having problems with has hardly a scratch/mark on it, obviously sat on a desk and never in a dock. The unit I am on now looks very well used, many miles in a truck.
It seems strange to me that the pampered unit is the one with a problem, while the unit that rattled up and down powerline right of ways, gravel roads and what not works like a top. Go figure, eh?
Next week is looking to be intense, probably full of 15+hr days. Next weekend I will have time, I hope, to run through your checks and will post back the results then.
If anyone else has ideas, I will add them to the list.
Life's Journey is not to arrive safely at the grave in a well preserved body, but rather to skid in sideways totally worn-out shouting 'Woo Hoo! What a ride!
Motorsports - the only real sport. If it doesn't have a motor, it is just a game.
There is always something waiting at the end of the road, if you are not willing to see what it is, you probably shouldn't be out there in the first place.