When initially selecting and loading any watch face the heart rate monitor works fine. After some length of time (20 minutes or so) the heart rate monitor on the watch face stops updating, even when selected for manual reading. The heart rate becomes static and doesn't change...on face MD323 the words wait appear, on other faces the action suggests readings are being taken but the display heart rate doesn't change and doesn't match what the heart rate app displays. Selecting a different watch face works ok for a while but eventually stops displaying the correct heart rate.
