I've been wearing a Coros armband since last winter. I've never had an issue till this latest update where the hr will randomly drop to zero during a run.
The armband still says connected though in the sensors screen on the watch but the watch shows zero hr.
So this morning I ran without it in a cold local 5k and the hr was 20-30bpm high!
Not sure why Garmin can't seem to have hr sensors that function in cold weather but it's very annoying.
The Coros was at least giving me consistent stable hr readings for all runs but now I don't even have that.
