Mini Countryman Diesel problems (model year 2014) with the navigation system screen

Navigationssystem is not working

Hello everyone, my Mini Countryman Diesel, built in 2015, has a problem with the navigation system. The system screen fails and no longer works. Have any of you had similar experiences? How did you solve the problem and what did your garage say about it? I'm grateful for any tips!

(Translated from German)