Glad to help, I also noticed other hardware interfering with the signal.
No idea what the Vero normally uses, I think RF, but the Harmony Hub connects with bluetooth which is easily interfered.
I found it kind of weird I only lost responsiveness with 4K and to be even more precise with 10bit content, at least I found a workaround for it.
Found my old topic: Erratic bluetooth behaviour with 10bit 444 chroma