I purchased a 2017 Specialized Roubaix Pro in November of 2016 and almost immediately experienced a creaking cracking sound coming from the seat post area. I went through 3 seat posts and 2 saddles and the sound persisted. I noticed that the frame had a flaw (hairline crack at the junction of seat tube and top tube), and Specialized replaced the frame on warranty. The new frame is even noisier than the first. I'm thinking this is a design flaw with the seat post clamp? Is anyone else experiencing this issue? It's so bad that it seriously detracts from the ride experience, and I would not expect this from a bike of this caliber.