Hi @MrDenis,
Diagnostics from ARC show a litany of timeouts on routine requests to both your Core and Roon’s servers.
A test to perform to try to isolate the issue is to compare playback of Qobuz/Tidal tracks to local content that you have NOT yet downloaded to ARC. Streaming service audio streams will route to/from ARC directly to/from Qobuz/Tidal servers (although the authentication for the stream still passes through your Core), whereas local content relies fully on your Core upstream connection.
If Qobuz/Tidal content plays back more easily, which appears to be the case from your most recent comment, then we can assume there’s a blockage in your Core’s connection to ARC. Given the other open thread you have, the tech support team has a suspicion we can resolve both issues by gaining a more complete picture of your home network.
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Are you using a VPN or any enterprise- or corporate-grade security on your home network?
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Is your ROCK hardwired via Ethernet?
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Do you have any additional network hardware in your setup that isn’t in the topic description above? IN particular, modem/router combinations, access points, or managed switches can be responsible for Core-side timeouts.
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Your Core-side diagnostics indicate that your Sonos devices are not communicating properly with Roon. Roon is, in fact, unable to parse any information about the devices through your router. Is your router firmware up-to-date? If there’s an issue with the router’s interaction with UPnP, it would affect both Sonos and ARC.