We have two Como 4.0 bikes that are less than a month old 200 and 300 miles. When riding in 10th gear both bike will make a clunking noise like the bike wants to chage gears. The issue is intermittent but will happen if you stay in that gear. The short term answer is to avoid that gear and we have an appointment next week at the bike shop. I did a search and found where other people have posted the same issue on the Vado model with 10 speeds. Some have had gears replaced others the whole drive system and the problem came back. Is anyone else having this problem?