I, too, am having Sonos problems since beginning to use the Almond+.
I currently have the A+ set up as an AP. With the Sonos bridge connected directly to the A+, I am able to connect to the Sonos components maybe 1/4 of the time. If I put the bridge back on the main router, I am able to connect but of course the remote components have a spotty connection, which was the whole point of using the AP.
So, the A+ has to be blocking something even in AP mode, right? How can I diagnose this?