XC Ski power on 13.10

How is power with XC skiing working?

I hope I do not have to change technique to make it work on my F6 using HRM Pro.

The readings I got today are as follows:

I think it is not usable, but can not explain how to fix it. 

Hopefully my technique is not that bad that it does not record power, but I only get radom recordings of power every minute or so.

Any ideals or suggestions what I can focus on to make it work?

Thanks

  • Today Nordic walking, asphalt, urban forest park, excellent weather, good visibility of satellites Everything is exactly the same plus speed deviation.

    Fēnix 6 Pro, software: 13.10.0.0, HRM-Pro software: 7.1

    Same place activity, Running, Fēnix 6 Pro, with data field GarminLabs "Running Power".

    Power and speed are normal