Temporarily turn off any VPN, virus scan, or firewall software (do one at a time).  Then launch the app.  If it finds your system, that’s your culprit.  You may need to get ahold of Sonos if you need help configuring the virus/firewall software to get around the block. 

Note: If it is the VPN, they aren’t compatible with the Sonos app, so Sonos can’t help, and it is very difficult to configure to get them to work together. 

Thanks for the reply, much appreciated. I’ll look in to this but I don’t use a VPN so that’s one less thing to consider. Thanks again. 

Sadly, all seems to be set up as it should be, still having to “set up system” on each occasion I try to use the app. 
 

im calling it a day and advertised the speakers for sale this morning. Shame as always did think the Sonos speakers sounded great but they have become almost unusable now. 
 

thanks for the reply again though. 

I have the exact same issue and it is absolutely infuriating. I’m tempted to throw the overpriced speaker out of the window.

I would appreciate any guidance from anyone who has found a solution.

Thanks!

I have come onto here out of frustration to find other people with the same problem. No system found! Then it will connect as if by magic then disconnect. I have uninstalled the Sonos app with the intention of reinstalling it to see if that helps but now can't even get started because the “accept” tab in the terms and conditions is greyed out. Advice regarding the router is not helpful as I have lots of other connected systems which are working fine.

I managed to speak to Sonos support who requested a system diagnosis be sent. They reviewed and advised that as I have a TP-Link power line adapter connected to my BT Home Hub 2 (which provides internet to garage Apple TV) and an Ethernet switch also connected to router (again to hard wire living room tv/Apple TV box etc) that it is causing the “system not found” issue!!! I am unsure why this would be the case as both are Ethernet connection and not WiFi in the home. The advice was to disconnect these and try the app, if successful this is confirmed issue. What is strange is that these have been connected the whole time I’ve owned the Sonos speakers and has NEVER caused any issues before the app update. I’ll try disconnecting and check the app to confirm this is the issue but if it is, it leaves with with the choice of having a power line set up to access WiFi in garage or using Sonos speakers!!! 
 

im not happy or convinced this is the cause but if it is, then I’ll be choosing the powerline as have my gym set up in garage and need internet access. 
 

Speakers will be advertised on eBay this weekend and will give Sonos one more try with a Five which I can connect via Ethernet, see if this helps. 

Can you clarify the TP-Link devices to garage, are they just providing ethernet, or is the one in garage also a WiFi device? Or is there another WiFi AP in garage? 

Where are the Moves, and do they move between house (BT Hub) and garage?

I think if you have the time, this will be a very good test to disconnect the TP-Link power line.

Yes, the tp-link device is connected to hub via Ethernet to power line adapters in wall socket which leads to another tp link adapter in garage where the tv and Apple TV are connected again via Ethernet. I’d does actually have a WiFi extender built in to the garage side yes. 
 

the moves are in the living room, approx 1 metre each side of the home hub router, they are rarely moved but if we do, they are taken to the garden. I have 2 x BT discs too. Prior to app update, the same set up was in place with thw TP-Link power line in place and never had any issues? 

I get the same error almost every time I open the app, "No products found" and that's with the simplest possible setup of both my phone and the era300 directly connected to ISP router via WiFi - no other devices involved.

I simply close the app and open it again and that fixes the issue most of the time - the problem usually goes away on 2nd launch of the app...

Same issue as me, however, closing and restarting the app doesn’t work for me at all. Occasionally (after testing) it sometimes works after approx 10 restarts but then simply vanishes again after a few minutes. I am simply not convinced it is linked to my powerline set up as the move speakers are literally right next to the home hub router, they should be easily close enough not to be confusing the WiFi extender located in the garage!! 
 

I have advertised them for sale now and planning on trying a Five speaker, which I can connect via Ethernet, to see if this makes for a stable connection. 
 

so very frustrating as the previous app version never caused any issues whatsoever. 

Agreed, I bought mine a week or two before the new app launched. Had 2 weeks of brilliance with a totally stable app that allowed me to edit playlists properly and was responsive throughout.

Sorry a simple close and open doesn't fix it for you. Doubt it's your setup since mine has the problem with none of the additional network complexity.

Wish they'd either launched the new app once it's reached feature parity with the old app if you MUST force users to only use the new app, or launch the new app broken and light on features as they did, but make use of it optional. Users will migrate to it once it's good enough if the old app stopped receiving updates. Doesn't half feel like the lag and connectivity problems are due to the switch to cloud based microservices for everything rather than the old app's direct API calls to the local device.

100%. The release was far too early as was (and is) littered with bugs. A real shame as do love the speakers but the only way I can access them is through voice assistance now, which has huge limitations. An option to revert back to previous app version would satisfy, what appears to be, thousands (if not millions) of users. For it to go on this long, with users receiving various “causes” of the issues experienced, all of a different nature but with the same “system not found” outcome, is really really poor. It seems obvious that all of our issues are completely linked to the new app alone. 
 

I am willing to try another Sonos speaker (probably a Five) which has an Ethernet connection to establish if this provides a stable connection. If the issue remains, I’ll look elsewhere for speakers. 

Agreed, one thing I'll try is pressing play on the device itself next time my app does this. If the device resumes whatever song I was last playing then it'll be clear the device is still connected to the network and can access the music services, and it is really just the app that's failing.

I am slowly getting a better picture of your network now, as every time you post, more devices are being described. 

Did you try with the TP-Link Powerline and WiFi extender powered off?

On you phone do you see multiple WiFi networks? eg one from your Home Hub router, one from BT discs and one from your WiFi Extender?

IIRC if you are using BT Whole Home discs you should disable the BT router WiFi.

The extender(s) may be creating a separate ‘_EXT’ WiFi network?

I only have my home WiFi network in available our home and the EE WiFi network (which is linked my existing home hub as forms part of my deal with being able to access BT HOTSPOTS). I’ve not tried disconnecting the power line yet but this is not a long term solution as need the internet in garage and the power line is the only stable connection I can achieve out there. 
 

the whole home discs are located on upstair and one in garden, and again are required for WiFi access in these areas. 
 

as said, prior to the update, I had zero issues with this set up. 

What I suspect is happening is your phone is connecting to a different network that your Sonos speakers are connected to, as example your phone maybe connecting to the EE/BT/guest/public WiFi, but your Sonos speakers are connected to the BT Disc Whole Home WiFi.

I can simulate the same as what you are seeing, if I connect my phone to the guest network, I don’t see my Sonos speakers from the App.

Ensure you are connected to same network.

Also try play.sonos.com from a laptop/tablet, do you see speakers there?

And, if you can try to turn of the powerline.

I did note you said you had zero issues, but you have issues now, and I am only trying to help you isolate where the issue(s) are

Appreciate the help, absolutely. I can confirm this isn’t the case (my phone auto connects to my “home WiFi” which is the same as the Sonos. The hotspot network is not connected to my phone at all as I have to manually join that network. I will disconnect powerline tomorrow and see if that does help. However, if this is the issue, it is not a viable long term solution to simply disconnect the power line as I need internet access in the garage so if this is causing the Sonos app issue, it’s an easy choice to keep the power line and get rid of the speakers. As said, I simply don’t understand why, since the app update, this issue has appeared as I had no issues at all before the update. Really is so frustrating that I have to choose between connecting speakers to an app or have internet access all throughout my house!! 

Definitely an app issue. Opened the app today and no products found, but while in this error state I can press the play button on the speaker itself and it does resume the song I was playing yesterday. I can also skip to next track and it works, so the speaker knows what album it was last playing and can still connect to the Sonos back end or music streaming service. Interestingly my other phone (pixel) doesn't have this issue. Only my OnePlus does. All one WiFi setup with no extenders etc...

Agree with this too. I can press play and music resumes, can access via voice assistant too so def an app problem 

I am also on a BT hub. I contacted Sonos support and they have a know issue with WiFi configuration.  The email received from them contained 

Thank you for contacting Sonos Customer Care.

As we spoke on the phone, please log in to your router and change/check the following settings 
1. For the band 2.4Ghz, please change Wireless mode from 1 to 2. (this will enable B/G/N);
2. If not set already, please change the frequency to 20mhz (802.11);
3. UPnP is already enabled, please disable it, save settings / re-enable UPnP, and save settings;
4. Power cycle router;
5. Power cycle Sonos speakers by unplugging the power cord, wait 10 seconds, and plug the power cord back.

i changed wireless mode to 2 and that seems to have resolved all my issues about not finding components, failing to group or change volume. 
Good to have a fix but beyond belief that they knew this and weren’t proactively telling users

Hope this helps. Colin

I had this issue too but what I did was go into settings then network then I hit update network. I updated the WiFi on all my devices and magically it worked. I updated it to the same exact WiFi it was already on and for some reason it worked.  I’ve been good for a few days with no issues now. 

If you are using an router with app try to figure out if your speaker is connected to your WiFi. If it isn’t connected you would have an information about no system, even if your phone is connected to the proper WiFi. 
I had a problem that my second speaker (any of my four) hadn’t be able connect to my WiFi. Even the diode was white after doing the factory reset procedure. 
Because you are sure that you are choosing the proper WiFi it must be problem with the speaker and its connection. 
It’s also possible to accidentally create the second empty system in the app, you should change your system. 

Thanks. I’ve updated my network, reinstalled my “system” and speakers probably 10 times already! I’ve factory reset both speakers 3 times too. Nothing I try seems to work. 

Hi all, just adding my voice to this as I have exactly the same very frustrating problems and have been trying to fix them for a couple of months now (I have two Era 100s and one Roam), specifically:

• My app always tells me the speakers aren’t connected to the network, even though I’ve connected them. About 1/5 times after about 15 minutes it changes its mind and will display (apparently randomly) 1,2 or 3 of my three speakers as being available. There is usually a problem with the though, most often that the volume is set to zero and I can’t change it on the app.

• Voice control still apparently works, but also with a roulette element to it - when I say ‘sonos play’ either nothing happens/error noise, or it starts to play from the Sonos radio, or it resumes playing what I was playing before. Sometimes I can control which speakers are playing via the app, sometimes I can’t.
• New this week: the microphones on the three different speakers seem to have combined/morphed. If I say ‘sonos play’ into the one in my bedroom, it will start playing in the living room, but not in the bedroom. The microphone on the living room one doesn’t work at all though, so I have to control it from the bedroom. Sometimes the Roam will join in, sometimes not.

I’ve spoken to my internet provider (talktalk) who have tested all the connections (and told me the solution some had found on their forum of removing ‘wifi optimisation’ doesn’t apply to me). Everything is fine. I’ve also done all the resetting/re-installing that others have tried.

Is there anyone from Sonos customer support on here who can gather our collective problems and try to find a solution? 

It is mentioned a couple of times, last year pre new App

And here:

Also, some info on BT site about the modes:

https://www.bt.com/help/broadband/what-is-the-wireless-mode-feature-on-my-bt-smart-hub-#: