ACC Problem: “no distance control”

Hello everyone, my fresh-from-dealer 1% Leasing Phaeton (GP4 year 8/2014 – what a lot of car for so little money!) accepted the ACC only reluctantly on his first ride on Friday. The vehicle driving ahead was only difficult to recognize, and if so, the ACC system turned off again after a few seconds. Over the weekend I then searched through the manual and the Internet and drove good things this morning the 50km to the office. But the ACC couldn’t be at all turn on first, there was always the message “no distance control”. So the detection of a driving car already did not work. Tempomat, however, works quite normal. I then evaded at rest place, engine off and on again. Then immediately continued and ACC switched on. Forward driving car was immediately detected (Aaaah….!), the ACC kicked me out again after a few seconds (Ooooh….!) and for the rest of the journey it quit the further ACC trials m it the message “no distance control”. Does anyone have an idea? To the dealer is not my first choice, is far away and maybe I also do something wrong? When does this message come? The manual is of course silent about it… Thank you for every tip, greeting Nik