Hi. I'm having a few problems with what I think is an intermittent slipping clutch. When I put my foot down in 4th, 5th and 6th gear occasionally the revs shoot up and the car doesn't speed up for few seconds. Every time I take it to my local Honda dealer the guys take it out for a test drive and can't find a fault. Sometimes it's fine for a few weeks and then it starts slipping again. The car is an 2009 diesel tourer. Only 50k miles done. My warranty runs out in 2 months. Anyone else having this problem? Any advice would be greatly appreciated. Thanks.