I have had my Fenix 5s for over a year with no problems till recently.
Recently my heart rate drops of a cliff edge about half way through my walk going from upto 120 beats per minute to as low as 40 beats per minute so not meeting any zones it's a real pain today I walk 8 miles with an average rate of 60 which isn't right. Even more annoying is that it records heart rate fine for a few days then does this there dosnt seem to be a pattern to why. Has anyone had this problem and does anyone have any ideas how to fix it. Also when i stop walking the heart rate shots back up to normal