sorry to hijack your thread udellrich but i have an almost similar issue and i’m not able to find a certain cause but i suspect the Denon is the issue, since i have a x2400h at home.
I play a 4K Movie (havent really checked the caracteristics of the files i have), and at first i immediately become a notification From my TV. Something like “no source found, please enable HDMI/arc on the sound options” (which is already enabled!).
After 1 or 2 seconds the Movie plays just fine, the only thing i notice are sound hiccups every 20 seconds or so, very annoying.
So i Stop the movie, and open it again. No notification this time, no noticable sound hiccups (at least not in that timespace like before), everything fine.
480, 720 or 1080p content has none of these problems.
So i suspect our Denons HDMI connections are very “Picky” with the Vero. Even when i wake up the vero From standby, the TV/AVR source does not Switch automatically to “Media Player” where the vero is connected. I have to enable HDMI2 input on the TV and Media Player on the Receiver.
More: i already tested 3 HDMI cables. Only with the 2 high speed 18gbps cables i bought From amazon i can get it display an image. If i use the one included with the vero, no image.
Even More: if i mess around with HDMI/arc settings, like for example enabling/disabling no thing works anymore. I have to cut all 3 devices From the power source, and then plug in the HDMI cables gently 1 by 1 for it to eventually work.
And i’m also using the 3.0 Hub i bought with vero, playing From my non powered USB HDD.
These are the reasons i think it has Something to do with our denons
Just my 2 cents Here.
Cheers to all