When I routinely checked my 935 this morning I discovered 5 separate cracks in/on the HR sensor on the back! I wear the watch all the time (as my Garmin account can approve) and am, just like my colleague athletes, very careful in handling and wearing my watch. As I check regularly these cracks are new to me and I'm wearing the watch since January this year. Now what to do? As a triathlete I swim twice a week, and biking and running of course.