My Garmin Forerunner 165 has not been displaying my Overnight Avg HRV consistently for the past 7 days. I wear the watch every night, and it records my sleep and HRV during sleep without any issues. However, the Overnight Avg HRV field is usually blank on most days this week, unlike previous weeks when it showed normally.
This problem seems to have started after September 7th as you can see on the second screenshot below.
