Hey @Rochambeaux,
Your logs show time sync failure on both Pi 5 and x86:
setdatetime-helper: all HTTPS Date fallbacks failed
This is not theory - it is in your logs. Why it affects your Pi 5 and x86 but not your Pi 4 is for you to investigate. The evidence is there.
I have tested Volumio on Pi and x86 - it works. Your logs show failures that do not appear on working systems.
Have you actually verified whether time is correct on your affected devices? SSH in and run:
date
If it shows a significantly wrong date, that problem is in your system. The guide I linked explains the time sync mechanism and how to diagnose it: [GUIDE] Volumio Time Sync Watchdog (setdatetime-helper)
Changing router DNS to 8.8.8.8 does not help if something else on your network is intercepting or blocking DNS/NTP traffic. Some routers, firewalls, or IoT security appliances do this.
Roon Bridge
I do not use Roon. The link I shared appears to be the correct plugin thread. Perhaps another Roon user can assist.
Kind Regards,