My Citizen Eco-Drive's crystal cracked about a month ago. I've never had this happen before and at first thought that might be the end of the watch. Thankfully, I found a local watch repair shop that replaced the crystal for $25. I was just curious if anyone might know what may have caused this crack. It was fine one day and then suddenly I noticed the crack and actually small sliver had broken off ( I should have photographed it). Since I've had this watch for several years, I'm guessing it was mostly a wear and tear problem that may have been developing over time.