I just got my 2014 GL back from the dealer because the Apps kept returning the message "No Network Available" all other functions were working perfectly. They diagnosed it as a failed mbrace module. They don't know where it is located in the car and they are waiting for Mercedes-Benz to assist in getting the part and how to replace it . Must not happen very often. Already have 2,500 miles on it since I can't stop driving it .