Every time I look at the heart rate sensor glance it tells me my heart rate and reports that it was measured anywhere between 1 minute and an hour ago. It also proceeds to check my heart rate. It says "Measuring" for about 30 seconds and reports "Try Again" no matter how many times I try. I remember this working the first few days I had my Watch. What's the deal? It seems like the sensor is working, but not on demand.