I'm glad he's sorted it, but it does make you wonder about the experts. In my experience the garage trade falls far short in the diagnostic skills needed with modern electronic vehicle systems. Technology has overtaken them and most can't be bothered or are too dumb to catch up.
How hard was it to remove 2 fuses?
All due respect, who is to say it was the fuses that fixed the issue?
From what i have read it sounds like the Electronic system was a red herring.
Why wasn't the Vdc/stability system flashing when this event was occurring, if it was what was unsettling the car?
My first thought was that the vehicles behaviour was due to road camber, which you later confirmed had an effect.
Do you believe there is an electronic system that can steer the car as you stated, i.e. make the wheel turn on it's own?
Self centering steering is a result of castor angle set during alignment, it doesn't come from a magical box.
It just sounds to me like a collection of smaller issues that Autolusso has corrected as well as the owner getting use to the characteristics of the new vehicle on different (or maybe the same?) road surfaces all contributed.
And i agree you can beat diy diagnostics as it reaches a point where it is not economical for the garages.
I'll get off my soap box now...