Lately, we have noticed this topic getting a lot of traffic. Although diagnostics are much appreciated, we do not always get the opportunity to conduct one-on-one troubleshooting.
If you are still having issues maintaining connection to one or more Sonos devices, sometimes, it's as simple as turning the router off for a few seconds. If this doesn't help, below you will find some useful content that we strongly recommend reviewing.
This article, that talks about
Speakers disappearing or dropping off controller. This is an issue commonly caused by
WiFi interference.
If you are still having issues, you may wish to get in touch with our
support team via telephone.
Try searching our articles for help with your question: https://www.sonos.com/en/support