I had this issue as well, and it was made ALOT better by a fluid change. I would do it again, especially if the car had gone a very long time with out a Tranny fluid change before the one you did 30k ago.

I remember Whunter saying something in the tech session about what exactly causes it, but I can't remember.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!