Zoakon

3 Weeks ago my AMG GTR had a message on the screen saying "Electronic Rear Axle Differential Lock Currently Unavailable. I took to dealer to check it out, was there for a week and they told me it was a softtware issue and they updated with the latest version from the factory, the same day on my way home the SAME message appeared, this has been happening several times last couple weeks now I have to take it in again, such a disappointment on this type of caliber of a car. Are any other AMG owners having the same issue.