Rear Door comming off door switch while driving

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Lately I have noticed when accelerating a bit hard or cornering the rear door comes off the door switch causing the light to come on and the beeping sound. On investigation I have found that the door has to move about 1mm for this to happen. I first noticed it when I had stuff in the back and going up hill. I thought the pressure of the items in he rear might be causing this problem. Now with nothing in the rear it is happening quite often.
I know it is the rear door switch because I pack it out a bit with tape and it stops the problem.

Has anyone encountered the same problem?
Due for the 50K service soon so will mention it to them then. But I am sure they will say "that is the first one we have herd of"
Regards
Crisp Image