Hi @Pawel_Rybak,
So we can better assist you, please provide a brief description of 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.
Is there any change in behavior if you reboot your Core and networking gear? Does listen.tidal.com (TIDAL web player) work properly with the same TIDAL account you’re using in Roon?