Techsquad,

From your description, this issue seems like a network loop. If you use managed switches, make sure that STP is enabled, not RSTP. Consult this list.

If there is a BRIDGE in the system make sure that its power supply puts out about 5.1V. Below 5V BRIDGE will become erratic.

I have heard that there is a potential issue between Aracknis routers and Sonos. This issue is still a conversation and has not been formally added to the list. I don't have any direct experience here because I don't use Aracknis.

By the way, Sonos support can usually figure out which switches and router you use, regardless of what you say. I don't know if they take the time to dig this out on every call. If I was on their end of a support call and discovered the inconsistency, I'd throw you into the "flake" bin.