I have a number of Sonos amps around the house, with two being connected to different switch ports. My network kept slowing down, dropping out, then coming back on again after a few moments. Basically, my whole network was virtually unusable, and this went on for months. Eventually I traced the issue to the Sonos system on my network. When I unplugged a whole floor in my house from the switch, I miraculously could still see the servers on that floor, be it with an incredibly slow response. WOW. I traced this to the Sonos systems being connected wirelessly and passing my normal network traffic between them. This created 2 separate paths to many devices on my network: 1 via the hard wired switch ports, and 2 via the wireless connection on the Sonos. Who would have thought that Sonos acts as a wireless bridge for my standard network traffic. It seems that this caused to intermittently drive my whole network traffic through a much slower Sonos wireless connection, which I measured at around 5 MBPS because of the distance between the two of them on separate floors. Once I disabled the wireless on the offending Sonos amp and let the wired network do the job, the problem disappeared and the network is working as it should have been.
Reading the Sonos documentation stating it having a separate private wireless network, it amazes me that it is not private at all. What a terrible issue Sonos created for my family for many months after I put the Sonos amp on a different switch port.