did a run today with my forerunner 955 (update version 18.22 from today):
first km slow: pace 6:04 min/km, av. heart rate 151
then 5 km fast with pace 4:51 min/km; av. heart rate 133 ?? (my common hear rate at that pace should be 180-190)
a sudden drop of the heart rate appeared approximately at the change of pace
All,
If you have not yet contacted Product Support directly, please 'vote UP' on this reply if you will allow me to add you to our internal report. I want to make sure everyone is added to the impact of…
All,
Thank you very much for your feedback so far on the Optical Heart Rate performance. In addition to what is already mentioned in The Heart Rate Sensor on My Garmin Watch Is Not Accurate, I want to add…
All,
Thank you for providing your feedback and activity examples. We appreciate your engagement and are continually improving our products based on customer feedback. If you can, please continue providing…
All,
Thank you very much for the examples you've provided here so far. I'm very sorry that the update did not resolve most of your OHR concerns. In order to look into your individual activities…
I would like to know why Garmin, instead of continuing to offer us copy and paste advice with which it clings to straws, does not fix a recurring problem throughout the forum, if the frequency worked on…
1. release watches that work absolutely solid and deliver useful measurement results.
2. render them useless by developing buggy firmware with more and more gimmicks and accumulating bugs. Ignore your own…
Hi I also updated to 18.22 and the HR reading gone bonkers altogether. I did warm up before my race today and did tighten my watch before the race but the HR did not go over 142 for a 5k race, attached is my pace and the reading.
and here is another race I did before the update few weeks back and the readings.
can you please check and advise on this?
The behaviour of the optical heart rate sensor after the update to 18.22 is still bad.
If I dont get an answer here from Garmin-Sierra whats the next step please? I really need to get this sorted as my training gone bonkers now 
A half marathon race wearing HRM-Pro ended up with the heart rate chart as above since 18.22 update. Something is wrong.
The same problem by me, i have noticed it after the last 18.22 update, first 3,5 minutes slow ride on a bike trainer is the heart rate higher during the warm-up than during the entire really exhausting training :D (measured from my wrist, FR955 Solar)
