Jeff, I went back to your original post to revisit your actual problem statement.
A couple of comments/Questions;
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First of all, Roon has nothing to do with Spotify/Tidal Connect; if you’re using Roon for your personal music collection or even accessing Tidal via Roon, it does not utilise Tidal Connect (and neither does Spotify, which isn’t support on Roon anyway)
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When you mentioned “is sometimes very difficult” did you only mean the one problem where the track is displayed by doesn’t start? Or were there other problems?
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Do you experience the exact same problem with Roon as with, say, Spotify Connect from your iOS/Android?
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Your Broadband speed of 50Mbps/12Mbps is pretty low, I assume you’re on an xDSL service since your ISP’s Router is the TP-Link VX220-Gv2? (Are you Australia based? In which case did you mean 50Mbps/17Mbps Down/Up)
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On IGMP Snooping, it’s not clear that’s the root cause of the problem you’re encountering. That said, I do wonder if TP-Link Support was telling you the truth, because according to the VX220-G2’s Specifications, it clearly claims to support “Advanced Function IGMP V1/V2/V3” ← which typically means it has the ability to Snoop IGMP. Problem is TP-Link doesn’t make a detailed configuration manual available for that model (presumably because it’s meant for Service Providers), so we can’t be sure.
In any case, if you can provide some additional clarity to the problem you’re facing. Also, it’s probably more appropriate to call in the dCS cavalry @Phil and email [email protected] so Phil can log this issue.