I paired the Edge 830 to my phone on Wednesday. It's now 5 days later. Since then, there have been 3 occasions where the 7-day HR on my FR935 has frozen (maybe would have been more if I'd noticed it had frozen earlier, but it's kind of hard to tell because it looks like it's still recording moment to moment HR when it's not. It's only upon checking the 7-day chart that you can see it stopped recording the day prior). After fiddling around, I get it to restart recording again, but not quite sure how I've been successful yet with various restarts of various devices. Does anybody else have this issue?