Any suggestion is welcome, even the ones that once proven on the battleground result to be incorrect.
Better than be ignored.
The misbehavior is not so much a problem, inasmuch that after a pair of minutes the PC starts behaving normally, as an annoyance.
Looking at the Task Manager while waiting for the net to engage on that PC, I've seen that the loading of part of the software that controls the net gets... held up for a while (
the already cited two minutes), then it finally loads and everything works well. What could it be? :-/
There is no such a thing as overkill. Only unworthy targets.