I updated my iOS app version last week after the release of 10.6. My speakers and Boost were updated at the same time.
My Boost and speakers are set up on a separate VLAN from my iOS devices. This has worked fine for the last 2 years using a custom igmp proxy config for my Unifi security gateway that manages traffic between my home VLANs.
This has stopped working after the Sonos 10.6 update and I now need to switch to my IOT wifi network to be able to access Sonos.
Anyone else having similar issues?