I use an Edge 840 on my bike, and transmit heart rate from my Fenix 6X sapphire. I usually do this by starting a ride activity on my Fenix 6X at the same time that i start one on my Edge.
Sometimes, I forget to start the activity on my Fenix, and the watch will eventually power save time out of the activity and my heart rate will disconnect.
No matter what I do at this point, I can't get heart rate to reconnect. It's almost like the 840 locks out new heart rate connections past a certain point in an activity.
Any suggestions on how I can get the heart rate to reconnect at this point?