Actually, I stand corrected. I have a Kenwood DNX7190HD, and it's the model that has malfunctioned.
With such poor quality, I am hesitant to buy another Kenwood product. In looking at my options, I'm pretty stuck on Garmin, and Kenwood is the only head unit that has it. I figure that to fix the Kenwood I'll be out a minimum of a couple of hundred bucks, if not more, to fix a 5 year old unit.
So, I've decided to buy a Pioneer receiver AVH-4200NEX with Apple Carplay features, and use a separate Garmin GPS. The problem with that is that the 2011 Sprinter has a cover over the center dash and no where handy to put the GPS. I saw a 2015 Sprinter model, and noticed Mercedes figured out that the cover was not a good idea and changed it to a half open type tray. I checked with a Sprinter parts guy, you can replace the tray with the cover for the new open tray. So I ordered it and will replace the stock tray. That way, I can use a stand-alone GPS sitting in the front of the tray in sight but out of the way, and have the receiver dedicated to Bluetooth phone and Apple Carplay as well as other features.
It seems to me that the head units with Nav do everything adequately, but nothing well. The reviews are not particularly encouraging on any of them. By separating them, I should have the best of both. Plus, if one fails, it's not as much of an investment as a head unit that has both built in. Anyone have an opinion about this before I order the goods?