6HP26 really harsh shift from 4 to 5

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Hello,


a have a problem with my 6Hp Gearbox at my 4,8is.


When I accelarating a little bit harder, gaspedal 2/3, and the gearbox should shift from 4 to 5 to revs go up and the gearbox engange the fifth gear with a hard bang. Not smooth as in all other gears.



It just happens at higher loads and always from 4 to 5 gear.


There is no fault code in the EGS an no limp mode.


Car has 380kkms. Oil change in the gearbox was done twice. As I have done it the first time, I also replace the plastic balls etc inside the mechatronic.


Does anybody has oder had such kind of problem with his 6HP and could solve it?