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Lower reading of heartbeat rate after sw 4.0 release

Does anyone has experimented a lower reading of heartbeat rate after sw 4.0 release?

Today I went out running and I noticed a considerable lower reading in heart zones. When I finished I compared the reading of my fr945 versus my fr620 with strap and with another smartwatch (Samsung gear S3), even counting heartbeat rate by myself. The reading in my 945 is lower.

I have 3 weeks with my new fr945 and everything was ok, but today after the release I noticed this malfunction.

What can I do?