I run our Sonos speakers in infra mode, connected to our Ubiquiti Wi-Fi network, which covers the whole house really well. Using Ubiquiti airTime I see what looks like a WLAN access point that's utilizing almost 10% of RF airtime when Sonos is playing. The MAC address belongs to the Sonos speaker which is currently serving as the controller. I would expect to see this if one of my speakers is plugged into Ethernet and Sonos is using its SonosNet mesh. My question is: why is this happening in infra mode?