Randomly, speakers on my network do not show up in the controller. The connectivity seems to be great according to my UniFi controller and we even added another AP to our network. Recently, one of the speakers that we've not had problems with before dropped from the network. I sent a diagnostic (7205281). In order to bring it back online, I simply power cycled the device (as i have done with the others in the past). A few moments later the speaker appeared within the controller. I sent another diagnostic (7205296) to show a "before and after". Sonos support folks... any guidance from what you can see?