Garmin, I give you 1 more month to fix the massive HR issues during Activities...

I understand your frustration but these kind of threads are useless and only clutter the forums... Also thinking that 'threatening' to leave is of any use, well... think again I'm afraid.

If I leave, Garmin doesn't care, you're absolutely right. But if their products are bad, people need to know.

In any case, it's more frustratiom than anything else. Walking around with a paperweight around my wrist isn't very useful for me.

Are you wearing the watch just above the wristbone and snuggly tight, but not too tight? Lots of optical hr issues are down to how the watch is worn. What is your skin tone/colour? Optical hr often struggles with darker skin. 

Has nothing to do with that. This issue started overnight first when 14.13 was released.

Can you roll back? 

Unfortunately, software upgrades can't be undone.

The upgrades the watch downloads are "deltas" which are essentially the differences between one version and the next.

We had the same problem on the 255 series. Heart rate was the basis for other metric calculations. If HR is wrong, all other metrics are meaningless.

Surprisingly, there were a lot of complaints about the inaccurate heart rate measurement, but Garmin remained calm and unresponsive in this regard. This is really disappointing.

forums.garmin.com/.../erratic-wrist-based-heart-rate-bug-root-cause

Garmin has released a bunch of new products. And I really lack the courage to waste money trying out this new series. It feels like things are getting worse and worse. When the new version is released, it is unlikely that Garmin will not abandon the old series full of bugs. I feel like an idiot buying the 255 series.

I'm starting to believe the stories told here are true: www.reddit.com/.../