I’m on here so the owners of this company know that many of their customers are unhappy.

Sonos has been aware that some users are very unhappy because they are not able to use their speakers as intended. They are working to make things right.

Ever since they kept doing the updates, it has been a nightmare. 

Sonos has always released updates throughout the years I have own their speakers. My first speaker was a ZonePlayer S5, so I have been through many app updates. With these updates came many improvements. While there are some who have issues with some updates, especially if it is with the old app, I can say that it was more than likely cause by the use of powerline adapters, wifi extenders or VPNs being used in their networks.

Network interference is a MAJOR cause of connectivity and streaming issues with Sonos.. it always has been. That's why there are guidelines:

https://support.sonos.com/en-us/article/reduce-wireless-interference

And network requirements:

https://support.sonos.com/en-us/article/sonos-system-requirements

If you have gone through all of this and you still have connection issues, then i would suggest you call Sonos support. That have tools at their disposal that can get to the root of your problem.

The default settings of some routers are not appropriate after the current SONOS updates.

This loss of connection is very frustrating whatever the reason. It happens with no warning. It's happened yet again. No modern product on wifi networks should have this regularly occurring problem.

What is losing connection for you - is the app losing connection with the system (i.e. No system found), or is music stopping playing?

Losing connection - no system found. I've tried all the suggestions and so far eventually get connected again. Frustrating.

​@Listenerwhenitworks 

You obviously shouldn’t have to, but have you tried assigning each Sonos speaker a fixed IP address in your router’s settings?

Then turn off the router and the speakers at the wall.

Then turn on the router (let it fully reboot).

Finally, turn on each speaker in turn so that each is assigned the fixed IP address?

This could/should help the network communicate more reliably with the Sonos speakers. (It does not harm, even if it doesn’t solve the issue.)

Edit: also ensure the app was updated to this week’s release, along with the system update that was also rolled out.

Hello. I'd done all that before including assigning a static IP. Hadnt realised there'd been another update (but it had done it automatically). Had used the unplugging router method this morning but a few hours later had to do that again. Now connected...for now!

And it's no system found again only a few hours later

Did the router on and off again. It connected. Moments later when I tried again no system found...

Can you describe your network?
What model ISP device? 

ISP device?

“Modem”, “Gateway”, or “Router”. The Router or Gateway typically provides WiFi.

Wifi hub

​@Listenerwhenitworks 

Here’s a little more in-depth explanation of network terminology that may help you provide more helpful relevant information about your network to allow us to better assist you.

• ISP_ Internet Service Provider which is the company that provides your internet service 
• Modem or Gateway_It’s the box that’s typically provided by your ISP. Gong forward we’ll just call it a Modem
• Router_The box that sends out a WiFi signal to allow your wireless/WiFi devices to connect to the internet 

Here is a progression of how all the pieces fit together typically called a “Standard” network of which there are two possibilities 

1. ISP > Modem > Router > sends Wifi signal to Wireless devices 
2. ISP > Modem/Router > sends Wifi signal to Wireless devices. In this setup the Modem and Router are a single box.

There’s one more network configuration called a “Mesh” network. It typically takes the form of #2 above with a additional  features. The progression is as follows:

• ISP > Modem/Router > sends Wifi signal to Satellite 1, Satellite 2 and possibly Satellite 3 which in-turn rebroadcasts the Wifi signal 
• The Satellites are boxes placed strategically in your home to extend the WifI signal output by the Router side of the Modem/Router

Assuming you understand the information provided would you say you have a Standard or Mesh network setup? Please provide the name of your ISP and hardware names/models.

Standard, then. BT, BT Hub

OK, thanks for the update. I assume BT is the equivalent of what I call a modem. BT Hub is the equivalent to what I call a router. However, according to the link below there are several models of the BT Hub. Which model BT Hub do you have?

https://www.bt.com/help/broadband/learn-about-broadband/different-types-of-bt-hub
 

Smart Hub 2

Turn-off the “smart wireless” option. Smart Wireless options have a tendency to steer devices to bands it thinks appropriate (2.4Ghz or 5Ghz). Sonos doesn’t play well under those circumstances. Just let Sonos choose the appropriate band which in most cases will be the 2.4Ghz. 

However, before adjusting the BT Hub settings….

1. Unplug all Sonos devices.
2. Make the suggested BT Hub adjustment
3. Reboot your BT Hub.
4. Make sure your device reconnects
5. Delete the Sonos App.
6. Plug in your Sonos devices and let them comeback.
7. Wait 5 minutes
8. Reinstall the Sonos App.
9. When prompted select “Join an existing system”.
10. Sign-in with your credentials.

FWIW, BT is not BlueTooth, but British Telecom…. I think. Those of us not in the United Kingdom are less familiar with these abbreviations, generally speaking. 

Yes British Telecom. Nervous about turning off smart wireless as it will affect all devices not just Sonos

I have over 64 clients on my Mesh Network of which 31 are Sonos. Smart Routing/Wiresless is turned off. Clients will select the band that best suits them; sometimes based upon signal strength. Although the 5Ghz band has a shorter range than 2.4Ghz it is faster.  

That said a client capable of using the 5Ghz may use it instead of the 2.4Ghz. If you decide to take my suggestion and you later determine that other clients are adversely affected you can always turn Smart wireless  on again. 

Alert:

Here’s one more option to try before disabling Smart wireless. Make sure that Airtime Fairness is disabled in your BT Hub. If that resolves your issue...then all good!  You’d still want to follow the steps I mentioned earlier (1 thru 10) for Sonos. 

Isn't airtime fairness the same as smart wireless?

No it’s not. Besides had it been the same I wouldn’t have suggested it as another option. 

Ah ha. Can't find ref to it on the BT Hub. Google said it was the same

Google was wrong...or wherever it said Smart wireless and Airtime Fairness are the same.

Here are snippets of both on my router, As you can see they are two separate settings and both are disabled.

Here is how to find Airtime Fairness on your BT Hub 2

Another point that may be useful. As you can see from the snippet below I have a Tri-Band Router. However you’ll notice that the SSID for all three (3) bands are the same. Configuring the Bands on your router/hub with different SSID’s can be problematic in some cases; unless you are assigning each device individually to a particular band.