Since this has come up again with recent Apple news of release of HD music, I thought a separate thread on this subject might be useful in general.
I will start with a link to a recent thread where this is seen to be a problem on Sonos:
I don’t have or plan to have HD music in my home, I don't believe it add to heard sound quality. But I have seen problems in the past with grouped wireless play while playing uncompressed files from Sonos line in jacks. And the link above is a case of someone having problems playing Sonos HD radio. In grouped mode as well as on a single speaker, where the Sonos response has been: ethernet wire the units to the core network.
By all accounts, Bluesound has the same problem. And so do many others I thought till yesterday...when I read here that Roon does this with no trouble at all. Now, I don't know Roon, except vaguely, to know that it is server software that piggy backs on to existing Wifi audio hardware. So, how Roon can do this when the underlying audio hardware cannot, is the first question I have.
I also think that these issues are what held Sonos away from HD all these years, while they kept saying that better heard sound quality from HD isn't supported by science. Now they do have some kind of HD on their S2 generation systems, have they addressed these reasons of unstable wireless music play that have been a concern in the past? And which, if one sees the link, are still a concern.
Finally I suggest that for the purposes of just this thread, discussions should not get diverted into the “is HD audibly any better” subject. I only said what I did above to declare that I have no personal experience of HD streaming.