possible problem with the clutch E90 320d

[andreimarians]

Usually when I'm in a traffic jam, and the clutch is used often, when I shift in 2nd gear the car starts to tremble. This problem occurs when I release the pedal of the clutch, at about the middle of the clutch course.
Then when the pedal is totally released the problem dissapears.
This thing happens only when I shift in 2nd gear.

Can anyone help me, did anyone have this problem?

[marti5]

I would say you are heating the clutch plate up making it distort, which will need to be replaced, as you say you are when your in a jam, so I think the plate is wearing thin, if its slipping, TEST: park on a hill ( hill start ) and try and pull away in 2nd or 3rd,if it stalls then its not slipping,if however it tries to pull up the hill and revs like crazy and you start rolling back its slipping, new plate required, while your at it change the thrust bearing and the trans oil.