I have 5 access points that are all connected to the same 8 port POE switch.

The POE switch is NOT connected to the router or network and the wireless function on the router is disabled.  The access points are somehow connecting to the LAN and finding the router gateway and internet and are they working...and they shouldn’t be!  One of the AP’s has a sonos plugged into it’s extra LAN port.  If I unplug it, the wireless network goes down.  It seems that the AP’s are using the SONOS wireless network and finding the LAN router through one of the wired SONOS in the house.  We have 13 Sonos devices in the house, about half are connected to the LAN.

1st question, is this possible...is my guess correct?

2nd question, how do I shut it down?  I discovered it because of network problems and latency.