I just received my series 2 yesterday, I am enjoying it. Yesterday the heart rate monitor seemed to work properly. When I went to the app it measured on demand, and also showed the last measured rate which was done automatically. Now whenever I go in to take a measurement on manually it seems to get stuck on measuring, then it says "Try again" again nothing, however it does appear to be doing the automatic measurements as it shows me the last measurement taken as a minute ago if I don't check manually. Anyone encounter anything like this?