[noggin]

There’s my answer of what to use going forward. Thanks for confirming.    

I have my N2 - and get occasional vision drop outs over HDMI in 1080p and 2160p output - whether in playback or the GUI. This is using HDMI Premium Certified cables that I also use with other devices and the N2 is the only device that drops out. 

I haven't experienced any visual problems yet. But then again, I haven't really tested it fully. I'm a little confused by "Vision drop out"... meaning, the video stops playing and your screen blacks out? 

Yes - and the TV flashes up it's OSD - which suggests the HDMI stream has been interrupted or changed format (as the OSD and flashing to black are what happens when an HDMI stream changes format or is corrupt)