Date registered: Dec 2005
Vehicle: 222.132 & 221.122 & 213.050 & 906.633
Mentioned: 3 Post(s)
Quoted: 39 Post(s)
Have you looked at the W211 forum, they have a lot of 7G-tronic info (I assume your car has a 7G-tronic box). I don't have one but I've understood from the forum that some get fixed with a SW update, some need the valve system replaced, perhaps something else. Should find a lot more info if you browse this forum (also references to TSBs).
Is it downshifting generally or between specific gears. I thought the 7G issue was more on upshifting at first/second gear, better check the old posts though.