1 of 3 pis keeps dropping stream

2 of my 3 raspberry pis works like a champ. The 3rd sporatically drops the stream for a few seconds now and then, and won’t go for more than a few hours before it drops the stream entirely. Then sometimes accessing the UI gets very slow. Could this be an overly full bandwidth issue? My internet service is pretty darn good, and I didn’t think 3 audio streams would even equate to … say… one person watching youtube on the network.

Or do I have a dud pi? I did all the same stuff as with the other pis re: network settings. I shut off wifi networking on all 3, and gave them dedicated ips, via ethernet. I’ve tried re-imaging the sd card and starting over, but same problems. Anybody have any ideas?