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HRM Pro dropouts and loss of dynamics data

I had my HRM Pro replaced by Garmin ~2 months ago, and for the first time today, during a structured workout on the 955, I've had a couple of dropouts that can be seen, and a total loss of running dynamics data from 30:15 into the run (as seen by the HRM Power recording value go from 0 ....as I was sat down recovering....to NULL).

HR data is still there after this, but shows further drops in data after the efforts and going into the recovery sections between sets.

955 and HRM Pro both on latest firmware versions.

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0 Viacheslav over 2 years ago

0 FUNKYLARMA over 2 years ago

Yes I have had a similar issue with the latest 8.80 firmware on the HRM-Pro. So far I have found it has always been after a break, it is almost like the strap goes to sleep. Although heart rate still records, everything just dies.

0 5135968 over 2 years ago

maybe related:

FUNKYLARMA said:
So far I have found it has always been after a break, it is almost like the strap goes to sleep.

https://forums.garmin.com/sports-fitness/running-multisport/f/accessories-sensors/301559/bug-if-hrm-pro-is-set-to-provide-speed-and-distance-for-one-watch-other-watches-do-not-recieve-running-dynamics

RD is broken on latest firmware

I had dropouts too doing a morning HRV test - it goes to sleep cutting BT connection and only wakes up if shaken - not ideal as you need to be very still for HRV testing!!

0 Viacheslav over 2 years ago in reply to FUNKYLARMA

I assume that the heart rate data at this time is taken from the clock - at the time of the loss of dynamics data , the pulse was higher than it should have been

0 Scillonian over 2 years ago in reply to Viacheslav

You could test that theory by wearing the watch such that the WOHR sensor is not able to make any readings. (Opaque tape over sensor, in pocket, etc.)

If the HRM-Pro then does go to sleep then you will loose heart

0 9970217 over 2 years ago in reply to Scillonian

Better disable OHR on the watch. It's well known optical sensor can "read" heart rate from your pocket, your wall or whatever the dumb algorithms try to identify as HR patterns.

0 Geekdu39 over 2 years ago

Hello,

Try this method related in my topic : forums.garmin.com/.../hrm-pro-no-longer-work

0 FUNKYLARMA over 2 years ago in reply to Geekdu39

Thanks I will give this a try, especially as last night I had another load of drop outs.

Do you know is the reset will clear the auto calibration data?

0 Geekdu39 over 2 years ago in reply to FUNKYLARMA

I think if it is a factory reset, all data of the HRM will be erased, except if the data is stored in the watch.

0 NastyPillow over 2 years ago

Anyone has a solution for this? I just had this exact same problem after a rest in my activity