Hi , I have the 2.0lt Petrol saloon . I had a similar problem with my auto trans when cold but also used to register as a different gear selected on the display. i took it to main dealer who rebooted the computer to try a fix but no joy. then took it to my auto trans repair man who found the selector cable was being pinched too tightly by the brackets in the transmission tunnel. he fitted a new cable and it is a dream now.