with my 2005, which i have had for 2 1/2 years, rarely, but occassionally, when going from third to fourth, it will pop out of gear. the dealer has looked at it, and can find nothing wrong. it only happens from third to fourth, and never when downshifting. i have just accepted this as one of the little things with this car, but i have driven a manual transmission since childhood, and this is not operator error. there is SOMETHING there that is causing this. yours sounds similiar.