I am so sorry we’ve missed on your post for this long . Please, accept my apologies.
Thanks for letting us know of the problem you ran into. When you say that one of your speakers disconnects, what do you see on your screen? Does it disappear from Settings → Audio, the Zone Picker or both? Are the two zones grouped together when this happens, or do you play music separately?
If this is still happening, we’d love to hear back from you