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Forerunner 965 HR - Erratic and WRONG !!! v18.23

Hi to whomever can solve this,

Over the last while, I have been monitoring my HR manually, as I have not been able to trust my watch !! today it really irritated me, HR was 148 and my watch has me as 95-110 !!!!

This has been messing up my recovery times, and ability to rely on my watch.  I can understand the watch having complications sure, but the HR is it's core purpose.

Any insights here, can anyone relate.  What I did find was stopping my training, pausing the watch, waiting a bit .. then resume ... it would carry on for a while then do the same thing !!!

And then somedays !! it works !!

Thanks in advance.