Roon Core Machine Apple MacBook Pro Networking Gear & Setup Details DSL Net, Core connected to Router with LAN cable Connected Audio Devices Linn Majik DSI, Sonos , all via LAN cable to router Number of Tracks in Library 30000 Tracks Description of Issue I‘m new to Roon and start…

The problem was not the cable but the socket. This one socket does not seem to work. I connected the MacBook to a different socket and it works now very well - with and without cable. Thanks for the support to everybody