This error has nothing to do with ip addresses. It’s about the hostname’s computer (and bonjour / netbios). For some reason, it thinks that another device with the same hostname exists on the local network. Best to give your device an actual name under System Preferences > Sharing > Computer name.
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Hey @Chris_I,
@Nepherte is steering you in the right direction here, as this doesn’t seem like a roon-specific issue. Rather, this issue is more tied to your computer itself.
Let us know if renaming helps 
Hi Ben, thanks for checking in; yep I think it was caused by the way I was using Roon (going between wired and WiFi too often) but Roon is not to blame! In any case I haven’t had the problem since I posted. I don’t think I did anything to ‘solve’ it but that’s computers!
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