Hi about a month ago my forerunner 935 stopped detecting my heart rate I have done the off/on, the factory reset and I know my software is up to date. The only time it detects my heart rate is when I'm doing a specific activity like running/cycling etc then blank with measuring the rest of the time (the green light doesn't come on at all). I don't mind too much as long as it reads during activity that's the main reason I have it but would be good to know my resting heart rate again.
Cheers brains trust
Georgia