Has anyone gotten an answer to this issue? For the first ten minutes of exercise it locks my heart rate at 100sh while I'm climbing steep hills, running, rucking etc doesnt seem to matter. Then after about 10 minutes it works really well. The common answer is wrist heart rate monitors tend to do this but that isn't true. My wifes cheap fitbit, Samsung, Apple watch none of them have this issue. I love this watch/Garmin but there has to be a fix for this. Most of my workouts are roughly 30 minutes and having a 3rd of it with bad date makes the watch almost worthless for what I do.
I've adjusted how I wear it, cleaned it, checked for scratches etc and its now been an issue on both Garmin watches I've had. Any ideas?