Today, for the second time, I broke a link in the chain of my Giant FCR-1 road bike. It's a decent-quality bike, two years old, with about 2000 miles on it. I weigh 160 pounds and am not a gonzo rider, so I'm at a bit of a loss as to why this has happened again. (I've ridden bikes for 30 years and never had a chain break before). The guy at the local shop who fixed it the first time (last summer) didn't have an explanation either. The chain runs smooth and quiet, and there's no obvious misalignment. Did Giant have a problem with quality control on their chains at some point? Should I spring for a new one, or just replace the link again and hope for the best?

Lee