hi guys, i have an Audi A4 2.4 Convertible B6 and it has only 50k on the clock but since couple of months i have been having this strange problem, please read and let me know if anyone has any idea how can this be fixed. when i start the engine in the morning after being parked over night and then drive away. for first half an hour or 45 minutes while driving in (D) mode it gives a bad jerk changing back to 1st gear when the car is coming to a full stop at lights or for any other reason. going up is totally smooth. BUT if i put the car in Semi-Automatic mode (SPORT +/-) down shift to first gear when coming to a full stop becomes totally smooth. after driving the car for about half an hour or 45 minutes this jerk totally goes away even in (D) mode. then during the day if i drive the car after leaving it parked for a little while (and engine temperature cools down) it gives the same jerk shifting down to first gear in (D) for few minutes and then goes away again. now another problem... it has happened 4 times now in last 2 weeks that i will drive away the car after being parked over night and when i am waiting at a red light. if i put the car in (N) Neutral while waiting and then when traffic starts moving i put it in (D) but it never goes into gear and i cant even rev up the engine, even though (D) lights up in front display. after a while on its own choice car decides to go in gear and starts moving. this problem also goes away after driving the car for about half an hour or more. please help me out if anyone understands what this problem is and knows anything about how to get it fixed. let me make this clear that no error message comes on the display. also i took this car to audi specialist and no error message came up on his computer when he connected the car with his system.