Hi @daghdaireland,
Thanks for reaching out to the Sonos community and for letting us know about your concern. We appreciate all your effort in performing all the steps that you mentioned to resolve the issue. Let me help you with this.
Based on the diagnostic, shows wireless interference in your Sonos system and it's caused by poor wireless conditions. Wireless interference can occur when two or more wireless devices compete for the same WiFi space. You can also find instructions on how to reduce wireless interference in our short video. Also, audio playback failure was detected. This is the reason why you can’t play selected content or unable to add tracks to the queue.
Let me suggest the next troubleshooting steps to help you out.
- Separate stereo pair on your Sonos Play 5.
- Open the Sonos app for iOS and Android.
- From the Settings tab, tap System.
- Under Products, tap the room with the stereo pair.
- Tap Separate Stereo Pair and follow the in-app instructions.
- Test music playback and adding song on each speaker.
- If the issue is the same, proceed to the next step
- Sequential reboot to refresh your network and all your Sonos devices connection.
- Unplug your network devices (modem, router, any wireless access points on the network) from the power and wait for 60 full seconds before you plug it back in.
- Once the router is back online, unplug all your Sonos devices from the power.
- Please wait 15 seconds before you plug back them back in.
- Force close the Sonos app from your iOS or Android device.
- When the status light on your Sonos speakers are solid white, get back on the Sonos app and check if you're connected.
- Test music playback and adding song on each speaker.
- Create a stereo pair
- Open the Sonos app for iOS and Android.
- From the Settings tab, tap System.
- Under Products, tap one of the speakers you’d like to use in your stereo pair.
- Tap Set Up Stereo Pair (or Create Stereo Pair if using the Sonos S1 Controller) and follow the in-app instructions.
If you're still experiencing the same issue, I recommend contacting our phone support team with your full network setup including the make and model of each device to further look into this. Please let me know if you have any further questions or concerns, we’ll be glad to assist you.