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Forerunner 965 18.27 update heart rate wrong

Ever since the 18.27 update, the heart rate on my 965 is completely wrong.  Nowhere close.  It’s showing 55 bpm during a strenuous workout. 

I’ve tried rebooting the watch, but that didn’t fix the problem.

Has anyone else had this problem?  I’m inclined to do a factory reset, but I’m curious if others have experienced anything similar