Roon RAAT and "An audio file is loading slowly"

[Will]

Strange that we have yet to hear anything from Roon support on this.   They're usually quite responsive.   Has anyone found a viable solution (other than the IGMP disable since my router doesn't have an option to change that)?   For now, I've just reverted to using AIR again.

Just to give you some idea; I actually did some A/B testing, constantly swapping between RAAT and AIR and the problem has not returned. Just playing music now. That's from a Mac mini via a Ubiquity switch over Cat.6 Shielded cable.

I have not had this problem now for several days - and have done a lot of listening.  My setup is far less sophisticated than some of those mentioned here.  In my case it was with Qobuz files - and the implementation of RAAT for Devialet did occur at the same time as the Qobuz launch in the USA.