Today I went for a hike and after many hours of correct readings the HR just skyrocketed to ~150 (way too high) without any reason and stayed there for 10 minutes, when I get off the watch and on again. Then it went immediately to 70 (way too low) and just slowly went up to the realistic ~100.
It was not too tight, not too lose, and I even tried to reposition it on my wrist many times before getting it off.
This was not the first case, it was reported many times - no result, it is still a garbage.
The real beautiful aspect of the story that the HR was broadcasted only to the garmin GPSMAP 67, and there is a critical bug in that device, so it is unable to sync the activity correctly or sometimes at all to the garmin connect so now I have no data of this.
Nevermind, I don't care at this point, I stopped to record any activities in garmin ecosystem (the data is completely worthless anyway) - just let you know that you just cannot count on the HR readings.
