For the past many months I have been trying to figure out why my intensity minutes have fallen off a cliff. My workload is the same, but the number of intensity minutes is way WAY down. Then I realized why. The optical heart rate is not working properly. So while my chest HRM was recording a heart rate in the 150s, the watch was only in the 120s. And even with the FR265 supposed to be reading the chest HRM, it only did so if an activity on the watch was selected.
My fix has been to wear the chest HRM and then broadcast my heart rate from the 265. This means the 265 is capturing the heart rate from the chest HRM and now my intensity minutes are properly captured.
Is this a pain in the butt? Most definitely. But is all I can think of to do until the optical heart rate is fixed.
Hope this helps those of you with the same issue.