whilst driving my a4 2.0 tdi quatro yesterday i got a grinding feel while disengaging the clutch i pulled over and whilst in tickover there was a knocking sound from the engine i turned it off and about 5 mins later started it again it changed gear fine and the knocking had gone dose anyone have any ideas what may have caused this the car is 2010 reg and has 110.000 miles on the clock many thanks