Helo there..
Not sure if this helps, but I've had this problem twice now. Does the pedal feel a bit rough also? Like its a bit "rippley"... if you get what I mean? And does this only happen when the engine has warmed up?
If so, it should be the clutch release bearing. As I said, twice it has happened to me, both times, took it down to the dealer and it was a case of a warranty jobby. Although the second time (about 6 months later) got the engineer a bit miffed, so much so he replaced my master cylinder, or so they claim and took my gearbox apart, only discover that it was the same problem and so another clutch release bearing sorted that out.
The second time was in June of this year, so fingers crossed, cos my warranty runs out in about a years time..
Hope this helps!
