I always use my vivoactive 3 as a heart rate monitor connected to my garmin edge 530. I use the broadcasting function on my vivoactive.
It has been working for a few years now. Since a week, my edge loses connection with my vivoactive, after a few minutes of cycling. I have removed the HRM device from my edge and reinstalled it, but that doesn't seem to help. What could be the problem? Both devices have the latest software updates.