My Sport died tonight. I was at about 50% battery just before dinner. About halfway through I went to check the time and... nothing. All black screen. No response to taps, the side button or Digital Crown. Got home and placed it on the charger for a couple hours... nothing. I have taken excellent care of it so it can't be physically damaged. Any idea what's up? Anyone else experienced this? I have a lunchtime Genius Bar appointment tomorrow. My watch was a Fathers Day gift so I'm hopeful that they will replace it under the 1-year warranty.