I bought a 2014 CLA250 a couple of months ago and the current mileage is 80,000. A couple of days ago, my friend was driving, and the eco engaged as it normally would. However, when it started, I notice that the radio screen went black and came back on, lasting about two seconds. Then it did it again with me driving. I noticed that the eco had turned off on its own and would not come back on by pushing the button. I had to stop and start the car again, then it would come on and off as it should. So, yesterday I was driving, and I forgot to turn the eco off and sitting at a light, eco engages and I put my foot on the gas peddle and the car died. No lights just died. I turned the key to the off position and then started it right back up. It drove fine. I haven't checked for codes and no messages on my instrument cluster.