Best answer by Keith N
Over the weekend we did have an outage over the weekend regarding this exact problem. The issue should be resolved at this point, but if the problem persists I would recommend giving our support technicians a call so they can have a much closer look in real time.
Additionally, you may find it helpful to check out our status page here. This website (which is also linked on the Community sidebar), will allow you to view real-time service status on Sonos and will inform you if what you are experiencing is part of an ongoing outage.