hey i bought my 1st s2 a couple of weeks back, and im having probs with the clutch. she judders on take off and some times in between changing gears, only when im on the biting point tho...

the biting point of the cluch keeps changing every 5 minutes, most of the time its REALLY low, as in about 2mm from right at the bottom of the pedal travel, and the from 1 sec to the next it goes normal, the juddering gets less (still slight juddering though). adjustment mechanism? (it went in my old 3i, but when it went i couldnt select gears at all, & i still can)

any ideas?