cjbutterworth,
Just to add, the S2 App is fine to use and in addition to trying a different SonosNet channel in the S2 App I would also ensure you set your Router to use a ‘fixed’ non-overlapping 2.4Ghz channel too 1, 6 or 11 - just not the same channel that you choose for SonosNet. They need to be different channels and to reduce interference also do these two things if possible:
- Set your routers 2.4Ghz band to use a channel-width of 20MHz only if you are able to do that in your routers configuration pages.
- Ensure your wired Sonos device connected to your router is at least 3 feet away from the router or a little further if possible.
Doing those things will help reduce Wireless interference.
I also suggest checking out these two ‘hopefully’ helpful links too:
- WiFi Interference
- Wireless Interference Video: Wireless Interference and Sonos