It's amazing that after exactly one year your post, Samsung hasn't sorted this issue out. It is very frustrating. My Fit2 pro is a month old and is already giving me the same problem. It stops measuring at any given time. When it stops, I always try to reboot but sometimes rebooting doesn't help. I think the issue is with "Auto HR". This morning before my run, I wanted to get the device running before I start and I battled (no HR reading update). So I decided to switch from "Auto HR" to "Frequent". I then did a manual measurement of HR and successfully got a new reading. I switched back to "Auto HR". Only then it worked and I could start my run. The second issue is the issue of incorrect HR reading. I had been sitting in front of my PC at work for about an hour. Gear Fit2 pro, on Auto HR, was reading between 135 - 137bpm but when I did a manual reading with my Note4 the reading 71bpm.
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