has anyone had any problems with clutches on sensodrive C3s?

I have just had my 3rd clutch fitted in a 1.6i after 19000 miles, the Dealer
doesn't seem to think there is a problem!

The symptoms are juddering in 1st and second, both in sensodrive and manual
mode.

It is a pity(!) because asides from this the car is very good.

Conroy Knapp