During last week, the gearbox got stuck in 3rd gear but after standing for a while it rectified itself, but now the gearbox does not change over as smove as before, especially going from first to second gear, it jurks, but also does not do this while cold, just when it was driven for a while, Spoke to bmw, they said i must bring it in, as it is either software or oil change in gearbox, will this be correct and if so is there anyway you can do it yourself ? or any other sugggestions as to what the problem might be and how to rectify it.