Vivoactive 5 Heart Rate after 9.28 update

Hi, Vivoactive 5 just updated to 9.28.  I started the cardio activity and my heart rate starts climbing like crazy, up to 170 while doing light cardio.  Seems to only happen on left arm.  Had my daughter wear the watch and seem thing happens when activity is started.

Heart rate seems accurate on watch face during normal daily use.

Any ideas?