I've got the same problem mate! got an exedy stage 2 paddle clutch, first time this happened I stripped the gearbox out and noticed that the springs in the clutch were loose! this was after not more than 3k miles and running 229 bhp, the clutch still had plenty of meat left on it but the springs were loose, I coated all the clutch springs with a little smear of 3 in 1 oil, sanded the clutch flywheel and pressure plate down with 800 grid wet and dry, its been fine ever since! Regard Neil.