My 2 years old Cannondale Synapse has a boat load of problem since I've owned it. The latest is the front derailleur stops working in the middle of the ride. Then for some reason, it starts working again. It's been in the shop several times but still nothing. I think part of the problem is it is internally cabled and something is making shifting a nightmare. Does anyone have any ideas of how to fix this piece of junk?