I've had a Forerunner 955 Solar for about a week now and love it. This is my first Garmin Watch (recent Apple Watch convert) and use Garmin Connect on my iPhone.
Everything went well for about a week, until yesterday afternoon it stopped syncing my heart rate while outside of an activity. The watch seems to show up fine in Connect and looks like it's syncing, but I'm not getting any heart rate data.
If I log an activity (walk, health snapshot) it does record my heart rate and syncs to Connect, and the real time view in Connect seems to show my heart rate, but nothing gets logged. As such Body Battery and Stress are not updating in Connect either.
If I view Body Battery on the watch it is updated, so it looks like the data is there, just not getting to connect.
I have tried rebooting the watch and phone, removing the watch from Garmin Connect on my phone and re-adding as well as manually deleting the activity files from the watch from yesterday. I also tried connecting via Garmin Express on my computer, which I have never done before. Got that setup and it shows that it is syncing, but there is no new heart rate data in Garmin Connect on iOS app or the web.
Any thoughts on what else to try?