I am Abraham this it happened so far 5 times on a high way the car drives well but if you de-accelerate from say 120km/h and then suddenly accelerate the gear does behaves as if u have put on nutral
Definitely sounds transmission related. Could be either a low fluid level, (are you leaking any?) or a solenoid issue, something internal to the trans, or a broken motor mount. have your local independent MB shop look it over for you.
Search Mercedes-Benz C-Class Questions
Mercedes-Benz C-Class Experts