hey all i have a 2006 DB 380.

Everytime im at 50km.hr and stay there i hardly have to press the acclerator to keep it at 50, but when i do this the car jumps back at fowth. like its kinda wanting to change gears all the time

anyone know the problem here?

PS: at 60km.hr it runs smooth...

the car has done 119,000km