my c5 exclusive v6 has a distinct thump when it changes from 2nd gear to 1st when coming to a stop. the thump is hardly noticed when the car is cold but very noticable when it has warmed up to operating temperature. citroen say "this is a characteristic of the gearbox". has anyone had this experience. i know some diesel boxes had faulty valve blocks replaced under warranty but cit say mine is ok. this car has already had the torque converter replaced under warranty.