2012 WRX Owner here.... Same issue. Gritty feeling clutch pedal. Left it at the dealer for 4 days with no resolution. Seems to happen once the car is warmed up. Goes away if I pump the petal a few times. I also have an intermittent squeak when releasing the pedal that can be felt through the clutch. Oh and also the trans grinds shifting from 1st to second sometimes.... Dealer can't replicate any of it even after having the car for 4 days therefore refuses to do anything about it.