Hello @Adam_Dabrowski — Thank you for sharing your report with us!
To start, may I kindly ask that you please provide some additional information about the networking hardware and endpoints being used in your current setup using this link as a guide. Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Today, Roon keeps connecting and losing connection every 2-3s.
Just to clarify here, are your remote devices losing connection to your Core? Or are you trying to play music to an audio zone that plays for 2-3 seconds and then stops?
Along with the computers you rebooted already, I would also suggest rebooting any relevant networking hardware.
Is the Mac computer connected via WiFi? Is the experience any different if you use a wired connection?