Automatic transmission!! Land Rover Discovery Sport 150ps Diesel

Hello dear people, I’m trying short and tight.. Drive the DS with the 9speed automatic 150ps diesel… Problem: The circuit from the 1st to the 2nd course and back= very hard .. also 4-5 you can feel a “back”.. In the cold state again more strongly to feel.. Also when switching from “P” to “D” or “R” there is no ruck.. Gear oil change did nothing… Land Rover workshop has as much idea of the gearbox as I do. Maybe you can give me a hint what it might be Nt.. ?? LG.