Since it crashed again (no sound from soundbar, tv complaining that there is problem with hdmi eARC, no picture on HDMI connected to Vero 4k+) I tried SSH-ing to Vero and it works.
I stopped OSMC with:
sudo systemctl stop mediacenter (the picture on tv switched from no signal to black screen)
and then:
sudo systemctl start mediacenter, (the picture on tv switched from black to normal OSMC screen)
and now everything is working again, OSMC is running fine, I can control it with TVs remote and again I have sound from soundbar on eARC HDMI
So a simple stop and restart from SSH brings back the functionality. I am running the test version from USB stick:
Kodi (20.1). Platform: Linux ARM 32-bit (version for Vero)
Release Kodi x32
Kodi compiled 2023-06-03 by GCC 10.2.1 for Linux ARM 32-bit version 5.10.106 (330346)