Andre, I had a GLC43 for 2 years and never encountered the problem, it is a fault with your car that is not applicable to all 43's. Hopefully the dealer will be able to sort it for you.
2017 GLC AMG43 premium plus, night pack, leather, intel lights, 360 camera, side steps. = sadly gone
Now GLE450 Premium plus, Selenite, Black/White Nappa leather, Tech plus pack, Driving assistance pack, Tow pack, Off road pack, 22 inch wheels.