I know this has been an issue for some time. I have a Twin Air bought in June 2012. Initially the stop start worked. Recently however it rarely functions if at all. My mileage isnt large (about 6000 pa) and maybe in the winter with lights on etc the battery doesnt get enough back up charge. Its been back to the dealer twice. First we had new sensors ( I think) fitted then the battery was replaced. Tested by the garage and found OK. After we got it back it reverted to not functioning. Its blooming irritating on a car we like a lot. Is this just something we have to live with now?