Heart rate with HRM-Pro + 17.26

Not sure that its exactly the same phenomena but I have had a few instances where I am getting "jagged" heart rate showing up vs the flat trend line earlier in the run. Also on 17.26. see the second part of this activity as an example. 965 head unit, HRM-PRO plus

Hi, it appened to me as well. There are two possibile scenarios: either the HRM-PRO+ is malfunctioning or it's a temporary problem. Before open a case to the garmin support, you can try to reset the HRM-PRO+ and try to download heart data at the end of exercise.

No, everything fine here with FR 955, FW 17.26 and HRM PRO with FW 8.80

Your chart looks, as if connection was lost. Maybe try changing the battery.

Just changed battery before the Saturday run. Chart is OK for me in Run activity too. This is different scenario, though as watch was not on my wrist. Did 5 min test after the Basketball activity while showering, but couldn't repro the issue. Will test again next Tue. 

Could it be, that the connection to the watch was established and lost randomly during the activity, so it was finally not transferred as whole from the HRM, but only the data was used which was received real time by the watch,

Yes ive also had issue with workout mode in hiit or strength . I seem very abrupt and not showing accurately

I had the same issue when HR was connected through bluetooth. Connect it with ANT+

Chart looks fine for this week's game, so probably some intermittent issue.

I'm having the same issue with the Fenix 7s Pro Solar and HRM-pro. The gaps only appear when the connection between the watch and strap is lost, so either the heart rate strap is not storing the heart rate info or the watch isn't overwriting the heart rate chart with the stored info. Renders logging the activity quite useless.

Were you able to find a solution in the meantime?

My post on the issue: https://forums.garmin.com/sports-fitness/running-multisport/f/accessories-sensors/359821/hrm-pro-and-fenix-7s-pro-heart-rate-gaps