I had my car parked for just 2 days an noticed the judder does start when the car is stationed for a few days, I also got into a major traffic jam where cars were moving bumper to bumper and every time i moved forward on the first the whole car just shrudders and moves forward, it has to be something wrong with the magnetic clutch, I am putting the car into the shop next Tuesday as the dealer seems quite confident he can fix this issue, I will give them just one chance and should the problem come up again, I have told them that I need a brand new dualogic gear box which they have agreed to provide. lets see how it goes, by the way my air bag failure warning light also decided top come on this evening, so need to have that checked as well