Your initial post ideally needs to provide a bit more detail to perhaps be able to assist you, so I have a few questions about your local system setup…
- How many speakers do you have?
- Are they running on S1/S2 Sonos App?
- How do you connect your Sonos system to your local network? Are you using a SonosNet (wired connection) with one or more speakers?
- What WiFi/SonosNet channels are you currently using?
- What wireless network SSID (if any) is/are stored in your Sonos App network settings?
- Is the issue happening with more than one music/audio source and which sources are problematic and how are you playing those audio sources …(Sonos App/Airplay/Connect/Bluetooth/SMB/Other?)
- What type of WiFi are you using - is it a centrally based WiFi router or WiFi mesh.. any other extenders or power-line adapters?
Also have you already tried a full reboot of your Router/LAN and all Sonos devices?
There are also these two links that you may find helpful too before replying back with the above additional information…
Wireless Interference Document:
WiFi Interference
Wireless Interference Video:
Wireless Interference and Sonos