Automatic Transmission problems of the 2007 Mercedes Benz S600

In repeated incidents, depressing the accelerator in my 2007 Mercedes Benz S600 had no appreciable effect. I was, for example, left adrift in heavy freeway traffic. Mercedes benz's largest northern California dealer was unable to fix the problem for months, even after advising me that they were "confident" that the problem had been fixed. I still do not know whether they were able to fix the, and the fact that they could not determine their cause gives rise to substantial concern that the problem exists in other s class vehicles. These problems recurred for months. The fact that no one was killed or injured is just blind luck. Ultimately Mercedes Benz repurchased the car as a lemon. I have copies of correspondence to mercedes, none of which it responded to in writing.