It might be that the 2 Sonos products are using just the one WiFi AP, but what about your controller device(s) that communicates with them? - make sure they use the same one too… if the problem  persists, I would look closer at the network setup, particularly if there is more than one AP, even consider trying a different router, perhaps.

Thanks for reply Ken

I have looked at my network setting, all my products are using the same WiFi access point (there’s only one in the house). I have tried resetting and setting it up again and have had no joy.

My setup hasn’t changed in years, have had the same router and products in the house. At a guess I presume it must be something to do with an update in the app that rolled out a while back.

Its a bit random, some days the playbars show up in the app then they disappear in the morning and I have to power cycle them.

Just a bit more info. The playbars are in separate rooms. The whole room disappears.

One room is just a a playbar. The other room is playbar/sub/surround

What router and controller devices are you using and have you considered running the devices on SonosNet (that’s with one device wired to your main router - but do not use a surround speaker or Sub)? 

If you do decide to try a SonosNet connect then also note the following:

• Set the wired device away from the router - 1 metre or more
• Set the routers 2.4Ghz WiFi band to channel 1, 6 or 11 only.
• Set the SonosNet channel in the App so it is at least 5 channels away from your chosen router channel.
• If you’re not using any Sonos portable products (Roam/Move) you can then also remove the network settings from the Controller App - see this link: https://support.sonos.com/s/article/3488

It could be something as simple as duplicate IP addresses being held by both your router and the Sonos devices. Try unplugging both of these ‘rooms’ from power, the rebooting your router. Once the router comes back up, plug back in the Sonos devices in both ‘rooms’. 
 

I suggest that you reserve IP addresses for all of your Sonos devices.

Thanks for all your suggestions. I tried a few things

• reserved all IP addresses
• rebooted router/reconnected all the devices
• reset most devices
• Separated 2.4/5 GHz WiFi and made sure they were all on the 2.4

No success unfortunately, one of the playbars dropped off last night already. I can’t hardwire any of the speakers as they are too far from my router (SKY SR203).

I still think its an update that occurred possibly about a year ago and since I have had this issue, this was never an issue before.

Sky Q? You’d need to disable the 2.4GHz repeating. Go to 

 and scroll to the relevant section.

It’s a pity you can’t wire one device (even just temporarily, to see what difference it may make). Anyhow what 2.4Ghz Wifi channel are you using and have you tried changing it? (Use 1, 6 or 11 …and try a channel-width of 20MHz only) - Also, is just the 2.4Ghz band showing in your Sonos App network settings, or do you have both bands listed?

Ken I am on Channel 6 on 20MHz only. I am going to try disabling repeating and see how that works tonight. Only the one WiFi listed in network setting which is the 2.4 one.

Thanks guys

Thanks for all your help, looks like disabling the 2.4GHz repeating seems to have fixed it. I had one drop off during weekend, but think one of my Sky boxes decided to turn the repeating on, will keep eye on it. I was able to keep 5GHz repeating on.