Stiggy22

Hi, new to all this. Got my Mercedes S Class 2006 W221 6 months ago. A couple of weeks ago I started the car, moved off, the car went from first then into second gear. It then won't change into third or back into first. It keeps revving, but no change. Nothing on the dash to say there is a problem. If I switch the car off and back on again, it works fine, goes through all the gears and accelerates fine.
Any body got an idea what could cause this.
Thanks