Trek Madone 4.5 gearing issues?

I pedal at a normal high cadence but tend to like bog gears, and noticed I constantly have chain binding and pedal binding issues which result in the rear gearing system (tention wheel?) rocketing forward or backward because the chain won't turn...I had the bike for 2 months and had the bile tuned and cables adjusted by a Trek bike tech. Could this be a bigger problem than what meets the eye? Are there any known issues with the standard system on the 4.5?