My last 5 runs gave me very strange hr-readings with a hrm-pro turned on.
I have changed the battery of the hrm-pro three times now... without success. How can I find out whether the problem is caused by my hrm-pro or my epix gen 2?

I found out something new:
When I start a running activity, I have the above-mentioned dropouts in the HR recording.
However, when I use the walkong activity everything works as expected.
I then reset the running activity to the factory settings in the hope that that would help. unfortunately in vain.
What else can I do?