My Instinct Solar keep turning off the wrist hr sensor after couple of seconds (sometimes after couple of minutes). The watch currently running on 16.00 firmware.
I did try to
- restart the watch
- reset the watch (with data erase)
- all above with Garmin Connect reinstall
The sensor itself looks ok as sometimes it provides hr data. It's "just" keeps turning off. I don't know when this behaviour started as I did not use the sensor for couple of months and I think we had couple of FW upgrades during that period.