Since the update to SW version 19.18 the pulse rate values have became quite inaccurate (usually higher than expected) and the HRV measurement during sleeping got very infrequent, almost no values at all.
Since the update to SW version 19.18 the pulse rate values have became quite inaccurate (usually higher than expected) and the HRV measurement during sleeping got very infrequent, almost no values at all.
Good news!
After restarting the watch, both the inaccurate pulse rate and HRV issues seem to be solved. Last night the HRV registration was perfect, as it formerly used to be. So, finally I got completely…
Same as this user too then 955 HRV data not being recorded - Forerunner 955 Series - Running/Multisport - Garmin Forums.
Not ideal, but since not everyone is experiencing the same issue I would try a soft…
So far it has worked fine, the line has been continuous. But in the last days, since the update it looks like this. 
Ok, I found. And it looks totally the same... interrupted. 
Thanx for your kind help, I restarted the watch, we'll see tomorrow, what happens. 
