Hi,
I am back to report here, that after several videos played yesterday I have experienced the green video play problem again (on all the videos I have started, subs, audio, menues are still correct).
After report I have also experienced the Vero detaching from the network, but that is now being handled in a separate thread: Network issue after recent update - #2 by fzinken seems like an ARP issue, trying to find the root cause there.
As for the green video: this did not happen during the week on my other Vero4k+ that still runs the old kernel, debian and kodi, so I am reasonably certain it is because of either of the 3 upgraded components. Let me know what to do logs once it happens again to get you more useful logs.