If it’s been happening for over a year I’m thinking wifi interference may be an issue. 
What type of network do you run? Mesh? Are you using SonosNet?

Lock your wifi signal to one of channels 1, 6 or 11. If you use SonosNet put that on one of the two remaining channels. Then shut down all Sonos devices and your router. Wait 5 minutes, then restart router. When it’s fully restarted and wifi is running, restart your speakers, starting with Beam. Wait for each speaker to fully power up before starting the next. 
See how that goes and report back. 

Hi Nik, thanks for your message.

i’ve followed your steps.

I’m on sonos net was previously on channel 6. I switched to 1. When i restarted router, turned off speakers and gradouly turned them on, channel was on 6 again. I have tried 11 and 1 but the connection issues remains.

It’s a little flat, speakers connected to a router directly. Signal it’s pretty good in the other rooms as walls as thin.

If all the speakers are wired directly to the router, it’s unlikely to have interference issues, unless the distance between the router and any Sonos device is not enough, such as to cause electrical interference. It’s more likely a duplicate IP address issue. Given that it’s been a year or two is odd, though, I’d assume the IP leases would have renewed already. In any case, I would suggest rereading the wifi interference FAQ, just in case there’s something there for you to consider.

I’d also try this, just in case: Unplug all your Sonos devices from power. While they are powered off, reboot your router. Give the router a couple of minutes to come back up, then plug in your Sonos devices.

A more permanent version of this is to go into your routers software and assign reserved IP addresses for all your Sonos…if that is possible (it isn’t always a feature you can access, check your router’s manual). 

Note that this has nothing to do with signal strength of your network, it is merely an addressing issue, making sure the packets of data are being sent consistently to the correct device. 

If neither of these address the issue, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

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.

Si todos los altavoces están conectados directamente al router, es poco probable que tenga problemas de interferencia, a menos que la distancia entre el router y cualquier dispositivo Sonos no sea suficiente, como causar interferencias eléctricas. Es más probable que sea un problema de dirección IP duplicada. Sin embargo, dado que han pasado uno o dos años, es extraño, supongo que los arrendamientos de propiedad intelectual ya se habrían renovado. En cualquier caso, sugeriría volver a leer las preguntas frecuentes sobre la interferencia de wifi, por si acaso hay algo que considerar.

También probaría esto, por si acaso: Desenchufe todos sus dispositivos Sonos de la corriente. Mientras estén apagados, reinicie su router. Dale al router un par de minutos para que vuelva a en marcha, luego conecta tus dispositivos Sonos.

Una versión más permanente de esto es entrar en el software de su enrutador y asignar direcciones IP reservadas para todos sus Sonos... si eso es posible (no siempre es una característica a la que puede acceder, consulte el manual de su enrutador).

Tenga en cuenta que esto no tiene nada que ver con la intensidad de la señal de su red, es simplemente un problema de dirección, asegurándose de que los paquetes de datos se envíen consistentemente al dispositivo correcto.

Si ninguno de estos aborda el problema, le recomiendo que envíe un diagnóstico del sistema dentro de los 10 minutos posteriores a la experiencia de este problema y llame al soporte técnico de Sonos para discutirlo.

Puede haber información incluida en el diagnóstico que ayudará a Sonos a identificar el problema y a encontrar una solución.

Cuando hablas directamente con el personal de soporte, tienen herramientas a su disposición que les permitirán darte consejos específicos sobre tu red y el sistema Sonos.