Best answer by Airgetlam
In my mind, it's much more likely to be a duplicate IP address issue, which is caused by your router's losing knowledge of where it is in the DHCP table, and exposed most frequently by the soft reboot that the Sonos hardware does during a software update.
What I'd recommend is a simple wifi refresh. Unplug from power all of your Sonos devices (including that BRIDGE), the reboot your router. Once the router comes back up, plug in the Sonos devices, one at a time, allowing a couple of minutes between each one.
If that does indeed resolve the issue, I'd recommend that you look in to assigning reserved IP addresses for all you connected devices in your router's DHCP table, it's usually fairly easy to do, once you know how. I had to reference the manual for my router online to look it up, but was a good thing to learn how to do, and has helped my LAN significantly.
But if that doesn't work, then I'd recommend that you submit a system diagnostic within 10 minutes of replicating this issue, and either post the number here, or contact Sonos to discuss it. There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.