Master reset. Re-enabling Heart-rate sensor. Upgrade to 19.74. Downgrade to 15.2. Updating again to 19.2. upgrading to 19.74. Brand new refresh (factory resetting of settings and data) Fully charging to 100%. Finally, a few days the problems with battery draining and lagging was resolved by simply disabling the Heart rate sensor function. Starting on 12/30/20, my app no longer calculates my resting or high heart rate for the day. It's also not showing the graph on the heart rate details. DW998.

garmin fenix 7 heart rate not working