FR970 heart-rate monitor dropping during hiking activity

I've used the FR970 on 3 hikes and on all of them I'm experiencing constant drops of the heart-rate monitor. It seems to just shut itself of randomly, when I take it off my the green light just stay off. After saving the activity, the heart-rate monitor starts working again, so I assume this is software-related.

Any ideas?

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Fozzee1970 2 months ago +1

Finally someone with the same issue as me.

I had this on my first watch. The replacement has done something different where on one run it didn't record at all. Out of interest do you have a chest HRM that…

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0 7771399 20 hours ago

Having the same issue with my Forerunner 970. Happened 3 times so far but out of maybe 100 recorded activities.

Midway through a running activity, my Forerunner 970 stopped recording wrist heart rate and the display showed "- - -" for the heart rate. About 15 minutes later the rate heart monitor started working again. I tried pausing and starting the activity and went through some menus without any luck.

No phone nor earbuds were paired when this happened. Each time I was playing music through the speaker of the watch that was downloaded onto the watch directly. Music did not stop playing while HR was bugged for 15 minutes. Power settings for run activity are set to "Normal" as well.