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Erroneous Heart rate during Floor Climbing

I have Foreunner 965 recently bought. whe i do floor climbing, the heart rate capture lags behind and doesn’t bit capture the actual elevated heart rate. i run up the stairs and my heart rate will be well above 140 but the watch will be showing only 108-110. i have tried to check and cross check this many times.

but sadly watch heart rate monitor is behaving erratically and recording g false values

pl look into it