I had this last September and October as well, where I saw my Garmin HRV drop by a few points. A lot of people made comments about software updates being the cause of it but I think it might just be a seasonal thing. 
I had this last September and October as well, where I saw my Garmin HRV drop by a few points. A lot of people made comments about software updates being the cause of it but I think it might just be a seasonal thing.