Sonos not working - error 1002 when playing spotify, error 1101 when updating

What type of router/WiFi network setup are you using - is it a centrally based router only or a mesh system? Any other WiFi repeaters, extenders, powerline adapters etc?

My modem/router creates my home wifi network, and a separate guest network. I have an Apple Time Capsule on another floor connected to my modem/router through an ethernet cable. The Time Capsule creates a wifi network with the same name as my home wifi network.

In my modem/router I can see that both Sonos speakers are connected to it, and not to the Time Capsule. Apart from the single Time Capsule I do not have any other repeaters/extenders powerline adapters etc.

It might be the case that SSDP multicast packets for ‘device discovery’ is not correctly passing between your router and the Time Capsule.. perhaps try the following suggestions:

1. Switch off your routers guest WiFi whilst it’s not in use.
2. Temporarily switch off the Time Capsule WiFi and just use your main router WiFi (or vice versa) to see if that improves/solves your issue. If it does, then try the WiFi network enabled on both devices, but not only ensure their SSID’s are the same, but also ensure their WiFi channels are the same too (I suggest using channel 1, 6 or 11 for the 2.4Ghz band) and also set that band to use a channel-width of 20MHz only.
3. If the problems still persist when trying the things above, I would rename the SSID’s on the Time Capsule instead and put its WiFi bands on completely different non-overlapping WiFi channels - so if you set your router to channel 6 in this instance, then use channel 1 or 11 on the Time Capsule instead.

Hope that all makes sense to you.

Thank you for the replies so far.

I removed the power cord from the Time Capsule and left it like that. Then I disabled my guest network and restarted my modem/router.

I still got the same 1002 error afterwards, so figured I may just as well try another Sonos system restart. But unfortunately this also did not fix the issue, and the Sonos system is still not working.

Does your router use the same SSID for both its 2.4Ghz and 5Ghz bands?.. What is its brand/model number?

It is a Fritzbox 7590, and 2.4Ghz and 5Ghz WiFi use the same SSID indeed.

Update: as of now my Sonos system suddenly decided to start working again. That is great on the one hand, but on the other hand I still have no idea why it stopped working and what the root cause of the issue is. Thus I am still suffering from a sub-par user experience.

Currently I have my whole network setup the way it was; my guest network is enabled, the Time Capsule is connected to the router through an Ethernet cable and is broadcasting the same SSID as the router on a different floor, and the Sonos system is connected to the router through WiFi. 

Strange that it’s suddenly started working again 🤔 - I’m just wondering if the Time Capsule WiFi, or Router Wifi, are set to use auto-WiFi-channel selection on startup/reboot/update? Maybe try ‘fixing’ the channels on both devices and see if that improves things - choose non-overlapping WiFi channel 1, 6 or 11 for the 2.4Ghz band.

Only do this however if your problems return. As it’s working at the moment, I would ‘leave sleeping dogs lie’ for now.

Alright, so I have had zero issues with my system for the past five days and today I get the same issue as described above again.

This is now the third weekend in which my system is not working, and it is getting a little bit silly that the system appears to stop working without any obvious reason and then starts again without any change to my internal network.

Is it possible to get any diagnostic information from my Sonos system? It would be great if the Sonos system can give a little bit more diagnostic information as to where exactly it fails during connecting.

Have you been monitoring your Fritzbox/Time-Capsule channels to see what may have changed? Did you set them to fixed Wifi channels, or do they (still) auto-select their channels?

I have not been actively monitoring the channels but will keep an eye on it from now. Currently my fritzbox is broadcasting the same WiFi network as my Time Capsule on a different channel (Fritzbox: 1, Time Capsule: 11). They are now still set to autoselect channels.

In the meantime, could you explain a little bit of background on focusing on the WiFi channels? To me the problem does not seem to be WiFi connection as all my wireless decices can connect to my Sonos system. Sonos however cannot connect externally.