Thank you for the detailed reply, @Arthur_Moseley.
On the switch, I would check the settings and make sure that Jumbo Frames is not enabled. I would also recommend enabling flow control on the switch if it is an option, as we have seen that settings resolve a number of issues for other users in the past. Since the Windows 10 Core works with the switch I think you should be fine, but I just wanted to point out that those settings can help.
when I try to choose Music storage folder in ROON, under \ROCK\Data I get an “Error Reading Folder”
Does this happen frequently, or was this the first time this has happened?
For next steps, I recommend the following:
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Can you give me some information about your audio devices? How are they connected (WiFi, Ethernet, USB, etc)? Can you share a screenshot of Settings > Audio in Roon?
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I know you mentioned you rebooted your NUC, but have you also tried rebooting your networking hardware and audio devices?
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Is there any antivirus or firewall active on the Core machine? If so, try disabling them.
Thanks,
Dylan