The gearbox wont sift to 4th in automatic. If program is switched to manual 4th gear engages normally.

i.e. when cruising 100km/h in manual, switching program to either sport or economy will cause the gearbox sift to 3rd regardles if the gearlever is in D or 3.

No fault codes in ecu or tcu.
Well serviced car with 195tkm genuine mileage.
Right amount and the right quality oil in gearbox, frequently changed.

Other than this the Car performs 100% ok.

I'm out of ideas, help would be appreciated.