Airplay troubleshooting

Hello all

I would love some help with a problem I am having with Airplay.

I find that very often - playing a song from Apple Music, with my Airplay speakers selected - after a moment or two - playback stops and I get an error icon in place of the Airplay icon.

See attached screenshot

Sometimes a reboot does the trick - but it often reoccurs the next day.

Setup is :

• MacMini - wired ethernet
• KEF LSX II Speakers - on wired ethernet.
• They are both on the same switch
• Unifi Network
• Multicast DNS switched on on the router
• I don't seem to get this issue when playing music through my iPhone
• I get the same issue if I use other apps on my Mac with Airplay (so it is not Apple Music related)
• I don't seem to get the issue if I use my MacBook Pro (though I have only tried it a couple of times)

I had the same issue before with a pair of HomePods. In fact, one of the reasons I bought the KEF speakers was because they can be wired. I thought WiFi could be the issue.

Any help much appreciated

Andrew