I'm hoping someone else has had this issue and found a solution. 2008 Unlimited Rubicon. Sometimes, and only seldom (maybe 3-5 times per month) the clutch will fail to disengage. The pedal just drops to the floor. Release and pump it again and it's fine. Master cylinder has been replaced and checked, slave cylinder bled and checked. Since it doesn't fail consistently I can't find the problem and it's driving me crazy. Any advice is much appreciated.