It could be temperature sensor proplem, that's what happened to my lupo, sorted the proplem after replace sensor. try to get error code from engine befor act.
It's to late for me,my pedal box was broken 6 months ago and cause my cluch damaged when i had to force the gear into reves,finally i pay 300pounds for both;(
i have same problem with my clutch, i think we should go to vw for a new clutch, just wonder how much will it cost me:( my lupo already done 70K and never been changed clutch.