I recently changed shaft bearing in the gear box.. after putting everything back in I ran a test drive for about a 1km and everything was fine. I waited for the car to heat up more by leaving it on idle after 30min I tried to test drive it, it couldn't move forward just engaging reverse only... left it and the morning I switched it on and it drove aging for roughly 2km then when I stopped for traffic lights it gave up on me can't move forward.. losing power and only drive on gear 1 after a while it then can change gears normally.. when you stop it seems it can't build up pressure to power it forward...