W220 5-speed gearbox problems

Hello motor-talker, I have the following with my S500: If the engine is cold, the gearbox switches back extremely late in sliding mode, so if I manually limit the maximum possible gear. I observe this especially from the 3rd to the 2nd gear. I had an oil change at 70 tkm. Current km stand is 85 tkm. Has someone already solved a similar problem or what are your recommendations? Or is that normal? Greeting Udo