Ikea Symfonisk Lamp Gen2 and Wifi.

Hard to tell, with the data provided. Normally, I’d think an IP duplication issue, resolved by a reboot of the speakers and the router, with the speakers being powered down during the router reboot. But you’ve said you assigned reserved IP addresses already in the router. 

My next thought is a version mismatch between your controller, and the firmware running on the Sonos devices. This would require them being temporarily wired to your router with an Ethernet cable to be updated, but this is a pretty slim possibility. When you do get them reconnected, it is worth checking in the controller for updates, though, just in case.

My other concern is ‘simple’ (not really) wifi interference , particularly from outside your network. While it’s possible it’s coming from inside your home, it’s equally possible (and has happened to me) that an outside influence has taken hold. In my case it was a new neighbor, with a new router, in a new location, stomping on the broadcast network I was using. Took a couple of days to figure that out. 

I would recommend that you submit a system diagnostic, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution, particularly outside influences to your network.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

After assigning the reserved addresses did you do a network refresh to insure they were being used? DHCP can sometimes retain old assigned address unless the network is forced to refresh everything.

-- Power down all Sonos, reboot the router and controller then power up the Sonos. 

You didn't mention any Sonos being connected to Ethernet so that and Sonosnet shouldn't be an issue.

Amazon and others sell really long Ethernet cables cheap and it beats hauling speakers to your router. Only used mine a couple times to help with updates but it was $10 well spent.

Hey Stanley,

I haven’t used Ethernet, although I’ve been considering it.

In my office, I might try it, since that’s the speaker I use the most and it’s close to the router.

However, the same issue happens with other IKEA lamps (in the bedroom and in the kids’ rooms), and those are not easy to connect via Ethernet.

What’s interesting is that before the update, I didn’t have any issues with the system at all. If you ask me, I would have stayed on version 16.1.

I skipped the whole upgrade mess back in May 2024, and I really expected the system to be stable by now.

You do not want an Ethernet connection for normal use, it complicates things and is not recommended. For a brief connection and forcing an update it is a good option. 

Hook each problem speaker to Ethernet, force an update, remove the Ethernet and reboot the speaker, they should recover from any update issues.

If all are up to date, check the status in the app, then power all Sonos do2n, reboot the router and controller then power the Sonos back up. That refreshes the addresses and relinks the speakers.

The more recent app and firmware updates are better but far from perfect.

If you are happy with having the Roam 2 devices as a separate system, you have the option to downgrade your existing devices back to S1.

https://support.sonos.com/en/article/downgrade-a-sonos-product-to-s1

Although reading that support article it would involve a factory reset of each device, resulting in all settings, Sonos playlists etc being erased.

​@AdriaticSun, Is your router a “Fritzbox”, by any chance?

Yes, it is a FritzBox 7590.

Basically, I have two of them, along with a couple of FritzRepeaters, all configured in a mesh network.

The secondary FritzBox in the attic (DG), near the IKEA lamp, is connected via network cable to the main FritzBox in the basement (UG).

In between, there are repeaters: one is connected to the router via cable, and the other is connected wirelessly.
 

@Smilja Do you have any ideas on how to improve the situation?

In general, after two months of using it, I am not happy with the reliability of the “new” system. The UX is somewhat better and I kind of like it, but what I don’t like is that I now have to spend time thinking about my Sonos system.

Before, it just worked — now it doesn’t. And that’s the bottom line.

And I can confirm that the IKEA lamp speaker loses its connection to the FritzBox router.

After a restart, it becomes available again.

This issue seems to occur only with the IKEA speakers, which makes them feel like second-class citizens in the system.

If the refresh I suggested above worked for a time but then failed you might try reserving ip addresses for all Sonos.

See your router's DHCP Settings page for instructions. Once done power down all Sonos, reboot the router,  wait for it to stabilize and power up your Sonos.

Today I made some changes to my router (FritzBox). Let’s see how it behaves over the next couple of days.

General

• I assigned each Sonos speaker a static IPv4 address.

• I disabled the guest network.

• I disabled mesh/band steering (to prevent the FritzBox from “kicking” speakers between bands or nodes, which can cause issues with newer Sonos firmware).

2.4 GHz network

• I changed the standard from Wi-Fi 6 to Wi-Fi 4 (older Sonos hardware tends to work more reliably with simpler, legacy standards).

• I also set the channel manually from “Automatic” to Channel 11.

5 GHz network

• For the 5 GHz network, I changed the channel from “Automatic” to Channel 48 (no change to the Wi-Fi standard).

Final step:

• I temporarily disabled the 5 GHz network to force all Sonos speakers (including IKEA) to reconnect to the 2.4 GHz network.
  Since mesh steering is disabled, the speakers should now remain on 2.4 GHz, while faster devices (phones/laptops) can move back to 5 GHz.

I then re-enabled the 5 GHz network and am now observing how the system behaves.

What channel widths do you have set for the 2.4 and 5 gHz bands?

20 is suggested for the 2.4.

Wi-Fi 6 should be fine to leave enabled, Sonos will negotiate and connect at the proper level

https://support.sonos.com/en-us/article/recommended-settings-for-using-sonos-on-wireless-networks

There appears to be an upsurge in connection complaints recently specifically concerning Symfonisk speakers.

One example from Reddit (moreso the comments) here but you can also find others  https://www.reddit.com/r/sonos/comments/1shc9ol/sonos_symfonsik_connects_then_doesnt_show_up/

​@Stanley_4 

Honestly, I’ve never had to change my router configuration before. Until now, I’ve always used the default or automatic settings.

I’ll try Wi-Fi 6. But since I’ve already made these changes, I’ll first observe whether there is any improvement with the current settings.

Sadly a careful reading of the app and more importantly the firmware release notices doesn't give us any warning about potential new issues that fixes or additions might cause us.

About all we can do is try what has worked for others and see if their solution now is necessary on our systems after the update process.

A bit the same issue with ISP and streaming service changes. Little warning and what was working may not be after.

I'm seeing "it used to work" issues here too, if I find solutions I'll share the issues and fixes. A bit short on time so progress is slow.

​@AdriaticSun, That’s a good approach. It’s becoming increasingly clear that the home network needs to be reconfigured in order for the Fritzbox/Fritz!Mesh to get along with the Symfonisks. I have no idea what happened or changed all of a sudden.

If the issue remains, your best bet is to phone in to Sonos Support.

Damn thanks for this link. I have 5 Symfonisk and feel like I have been chasing my tail so to speak trying to figure out WTF is going on with them. 

​@Mangoe, What’s the make / model of your router / WiFi mesh? The issue is circling around a German manufacturer’s networking gear.

AVM (the manufacturer of FritzBox) recently (5 days ago) released a new FritzOS update from version 8.20 to 8.25. In the release notes, there was a mention of “mesh improvements.”

I already described the changes I made.
After the update, some speakers were connected to the 2.4 GHz network and others to the 5 GHz network. I then forced all devices to reconnect to 2.4 GHz by temporarily disabling the 5 GHz network.

However, the “stickiness” is not working as expected. Some of the IKEA speakers are now on 2.4 GHz, while others are on 5 GHz.

I also disabled auto-channel selection for both networks.

Interestingly, over the past 5 days, I haven’t experienced any interruptions. I’m still observing the system, of course.

My preliminary conclusion is that the new update may have improved connection stability. I might switch back to auto-channel on both networks to see if there are any differences.

So far, it’s working well.

​@AdriaticSun, As a side note: the company has been sold, it is now called Fritz!

You can try and set 2.4 GHz to 1, 6 or 11, whatever works best.

I tried auto channel selection and decided it was making channel decisions based on something other than channel utilization at my peak Sonos listening times.

I do much better taking an occasional look at the channels, during my normal hours, and setting based on that.

Doesn't help the neighbors are all set to auto and their gear makes as bad decisions as mine does.