Nikon D600 with Atomos Samurai Blade PROBLEM!

[Arska]

I've installed 1.01 update on my Nikon D600
And I have put AUTO on my HDMI settings in D600 menu.

But when I record to my Samurai Blade (it says in the corner 1080p25)

D600 changes the quality to much lower than actual 1920x1080. Samurai records it still with 1080p25 ProRes.

I use Atomos SDItoHDMI converter. Could there been problem with cables?

I have a video where you can see that when i zoom in and out, it changes from full hd to much lower quality:

 

[Arska]

Any ideas why is it changing quality? When i use the internal zoom to certain point, the image gets much better, then I start zooming out from the camera and it gets back to lower quality.