Not heard of it marvanitis, can you get it covered under warranty if it is a design fault.
Would help if you added your location to your profile, a lot of the queries on here are market specific.
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.