My 935 delivers wrong HR readings (wrist sensor) when I start a run. It jumps quickly to 140+, while the real (measured) values are still around 100-110 during the warm-up.
If I stop for about 10-15 seconds, the reading drops to the correct value, and after that the readings are correct for the rest of the training.
Has anyone experiences similar problems? Any "trick" I could implement to increase the accuracy of the sensor ?