The car enters limp mode in the highway where it looses all the power and warning pops up as active brake assist is inoperative, traction control lights come on as well. if you manage to glide the car to a stop and restart the car, the car starts to back up as normal. took the car for service several times, intake airflow sensor was replaced but the car still has the same issue. upon searching online, this is a very well known issue with the newer mecedes cars where the car goes into a safety mode where the engine cuts all the power turning the situation into a even more dangerous scenario. as part of the safety mode, if the car looses all the power, then there is few things that can be done to come out of it. this is a major safety concern as repeated occurence of this problem has the ability to cause a severe accident.