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Weird HR data

Hello everyone,

For several weeks (I feel like since the update which included naps), the heart rate data has often been inconsistent. For example display of 150 BPM while I walk calmly.
Or even 90 BPM during a cycling session while my heart rate belt displays 130BPM.

I had already tested the difference between the heart rate displayed by my watch and that of a heart rate belt, the difference was not huge. But in recent weeks, it has become enormous... I no longer even have confidence in the frequency displayed at rest, or during the day..

Do you have a solution? are you reproducing the problem?

PS : I've had the watch (FORERUNNER) 255s since it came out, never had any problems before

thank you