It does seem to be the SVGA cable is not staying tight. Next step is trying a different SVGA cable. Fortunately, I have at least one spare cable for everything for the last 20 years. At first glance the missing red problem is solved. I will wait a day or two before discarding the suspect cable.
Because this ancient Viewsonic rotates for portrait mode, I tried it. For Word documents, this looks like it might be very nice.
I have seen loss of red once, but it went away when I hand tightened the screws. Being in potrait mode may help by reducing gravity's pull on the plug. (Putting the plug on the bottom means it is also a nuisance to plugin.) I think I will use one of my precision screwdrivers to tighten the screws a bit more and see if this helps in landscape mode.
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