Best answer by Airgetlam
I'd recommend two potential solutions to look at. First, I'd encourage you to read the wifi interference FAQ
Second, you may be experiencing an issue with your local wifi, which can be reset by unplugging all connected devices, rebooting the router, and then plugging each device back in, one at a time, allowing each one enough time to fully boot up before moving on to the next.
An alternate solution to that would be assigning reserved IP addresses to all of your Sonos gear, if you have the ability to go in to your router and do so.