Thank you Yorgi!
Thanks Yorgi for your fast and professional advice.
One thing I don't understand is that after a few (5 to 15 minutes) driving suddenly all the lights are going out in 1 time. Looks like 1 big problem in stead of 4 smaller problems.
After a few minutes when the lights are out, all the systems work properly.
That's what surprises me.
By the way, the normal price for my "6" in the showroom is 400.000 US$.
Grey market price (new car from UK), less than 300.000 US$.