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					Originally Posted by KevinH1990  There was a Wheeler Dealers episode that featured a Boxster with a problem tiptronic transmission:  https://www.youtube.com/watch?v=oS_yKQRcln0 
If you haven't checked for this problem already, it may be worth a shot. | 
	
 
I agree with Kevin.  Check the fluid.  It might be low.
When I saw the orig post, the Wheeler Dealer episode was the first thing I thought of.