@Olaf-Gottschalk
My main activity is biking (trail / enduro) and I use OHR.
It stops receiving HR literally every single ride. I’ve noticed that it stops when I make a short pause during a ride. It may be a traffic light or sip of water. Then OHR shows impossible low level for HR instead of real one.
My solution is to remove watch from my wrist, clean the sensor and put it back on. It works for me (mostly). It takes some time - so maybe this is also a factor.
But it is very annoying to have that kind of problem. I am forced to observe the watch to catch the moment when problem occurs.
SUUNTO - please verify this case.
And fix it please.