Forerunner 165 - 3rd watch, still inconsistent HR

Yes I know if we want good HR monitoring we should get a strap however I would expect my watch to do as advertised.

i am currently on my third replacement and still seeing issues, yet garmin are completely silent on the issue.

my issue is during workouts (mainly running) I see inconsistent HR data such as not tracking, huge drops, huge gains etc.

Below is an example of today’s, a complete drop off and the watch then barely never registered above 100BPM for the duration. 

 I’ve tried all the standard trouble shooting, one of the replacements I had I didn’t update but still the same issue.

come on Garmin, what are you doing about it as it isn’t just me.