This is indeed a very interesting thread Marc.
Looks as if you've narrowed it to the driver. I would not have thought of the driver being a potential source of problems so well done on finding this potential source of the problem.
I would never suspect the USB nor cable as there is error correction on the communication protocol. It's not like superimposing noise on an analogue line or whatever as it is entirely digital. Only speed would suffer due to interference I would think.
Darrin...
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