HR Wrist Bad readings

Hello

I've a F6 Pro and I've noticed since the beginning a bad HR readings.

Updated to FW 5.74 sensor Hub 4.11 and the situation change...:) HR was almost perfect...also many users report that 

But now with FW6.0 and Sensor Hub 4.2 the situation cahange again :(..bad lecture...the hear rate remains constantly high...

does anyone has the same excperience?