First time I checked after experiencing this problem with the 9PP , I was running software version 2.48.16. Now with version 2.50.28, it’s still the same: Every few days out of the blue, the heart rate monitor LED lights stop working. Only after switching the watch off and on again does it reactivate. Impossible to accurately track sleep and HRV at night, since this issue messes up the statistics.
I’ve been loyal to the Suunto brand for over 10 years (First had a Suunto M2, upgraded in jan. 2020 to a Suunto 9 and now, since jan. 2025 Suunto 9 Peak Pro), but my loyalty is now seriously challenged.