Sonos Beam/Sub Woofer and surround Sonos 1s drop off app when I add Sonos One

This usually happens when the Sonos One is added as a separate room instead of being bonded correctly.

A few things to try:
- Make sure all Sonos speakers are on the same Wi-Fi network.
- Go to Settings > System > Your Beam room and check that the Sub and surrounds are properly bonded.
- Remove the Sonos One from the system, reboot all speakers and your router, then add it again.
- If the Sonos One is meant to be in another room, don’t group it while TV audio is playing, as home theater setups don’t support grouping the same way.

If it still drops, submitting a diagnostic in the Sonos app and contacting Sonos Support would help pinpoint the issue.

This suggests you have created a separate system when you added the One.

In order for your existing Living Room setup and the One to appear as two separate rooms in the app, when the app shows your Living Room, factory reset the One and follow the prompts in the app to add the One.

https://support.sonos.com/en-gb/article/reset-your-sonos-product

Hi Mr T and Casey Hunt

Thank you for coming back to me so quickly. I am not particularly tech savvi, but will certainly give what you have suggested a go and let you know how I get on.

Thanks again

No offence to Casey, but there should be no requirement to reboot your Beam, Sub, surrounds and router to fix the issue you are having.

Hi Mr T, 

That suggestion worked! So simple when you know how...lol.

Thanks again for your help.