I have to withdraw my statement. The noise came back. It is obviously a more serious issue, hence hardware related. Meanwhile even the base of my „premium“ device surface book died the very common not-charging-issue. Just read all the reviews on the MS shop for surface book or go to amazon and scroll through the 1 star reviews. The surface series is of extremely low quality. The high price is partly due to the high return and replacement rate MS suffers from for these devices.
I can only double warn anybody to puchase this device. You will regret it very, very likely.