Optical heart rate works fine during easy long runs, but I have the same problem with all hard workouts

Optical heart rate works fine during easy long runs, but I have the same problem with all hard workouts

Is this just recently?
Have you done a soft reset recently?
(Hold in light button untill the watch shuts down completely Then restart after a 20secs)
Also try reinstall software - go to settings , about , press light 8 times, then should see reinstall software.
Maybe one of these things helps.
I did that a few days ago, but no improvement
Thanks anyway
, thank you for sharing. May I have permission to reach you via email and view examples in your Connect account so we can further investigate?
Yes,of course
Thanks
Typical problem of garmin HR for last year.
Love my watch but wasn't a reliable HR. Anyone solved this issue with a HR strap?