sonos keeps cutting out. sonos suggests A network switch with an IGMP Snooping option will be the fix

Very kind.  Thanks so much. I’ll do some digging.   Or will have 14 speakers to go !  It’s driving us mad going in and out all The time 

Hi. We ordered the tp link to-sg105 you recommend 

can I please ask what we do with it from our router and how does it fix the issue please ?

sonos said this last 

“I'll be more than happy to arrange a time to call but have very little further to add at this time. We must reduce the flooding and then combat the high amount of wireless interference. 

I'd much prefer a switch to be introduced with further testing and diagnostics to follow.”

The ethernet switch is a portable multi network socket. You can hard wire up to 4 devices to it (TV, PC, Sonos etc.), the port which reads ‘Link/Act’ being the one you plug into a free ethernet port on your BT smart hub.

Sonos uses multicast for discovering and grouping purposes. IGMP snooping restrains the multicast traffic in your switched network to prevent these data packets from flooding your network if more than one multicast enabled streaming device (Sonos or IPTV for instance) is wired into your network.

Hi  ok   we will do that      

our router has four ports so i dont see why plugging them all into the tp link if we just plug that part into the router makes a difference and put all in the tp link how that makes the drop out issue go away im   happy to try !   its reeeeeally bad !

many thanks 

ill update if we get any joy..  appreciate your help !

Few routers are IGMP snooping enabled, and as the diagnostic report points to multicast flooding the BT smart hub is probably incapable of handling multicast traffic.

In case the drop outs persist: If 'Auto channel' is enabled in your router, then disable it and set a specific channel, either 1, 6 or 11. Change also the SonosNet channel ('Settings --> System --> Network --> SonosNet Channel') to either 1, 6 or 11. That means when e.g. SonosNet is set to channel 1, put your router on channel 6 (or vice versa). See also Reducing wireless interference. If you’ve got a HUE bridge put ZigBee on channel 25.

Edit: Make sure that you’ve removed the WiFi credentials from the system. On iOS or Android: From the Settings tab, tap System > Network > Networks. Select the WiFi network you'd like to remove, and tap Remove. Wait about 10 min, then go to 'Settings → System → About my Sonos System' and see if WM:0 is being displayed next to each unit.

You should dump all of your Sonos equipment. You should never have to deal with statements like this. I have never had an issue setting up any speaker except Sonos and their terrible technology. And then for you to be deciphering networking jargon like this is a shame. It’s not you, buddy, Sonos is junk.

I was having this issue every time I used my Sonos across all music streaming services and my iOS airplay.  It would happen intermittently every five minutes.  I read through all of the suggested fixes and was unable to eliminate the problem.  However after hours of trying different things I was able to figure out a fix that isn’t discussed in the troubleshooting guides.  Here is the fix - hopefully it helps eliminate some headaches for someone:

Most Wi-Fi routers these days come with two network speeds - 2.4 ghz and 5.0 ghz.  Typically 5ghz is higher network speeds but lower range distance.  2.4 is a little slower but has better range.  Most routers separate these channels with a separate network name such as “network-name” and “network-name_5g”.  I had part of my Sonos on the 2.4 network and part of it on the 5g network depending on distance from the router.  Don’t do this!  Go to settings in your Sonos app. Choose system.  Then network.  Make sure only the 2.4 or the 5g network is listed - not both.  Worked for me.

It’s just a setting on the router that my 12yr old grandson could do - you’re making a big song and dance about a simple setting change on a router that should be supporting multicast broadcasts across the LAN in any case. It’s no more difficult than switching off/on a WiFi network on a mobile device.

I know this is an old thread but I have some information that may be useful to people searching on Google. 

I am a network engineer dealing with muliticast traffic on a far bigger scale than Sonos (1000's of Gbps across several hundreds of endpoints)

IGMP snooping alone doesn't do anything. You must have at least one IGMP querier on the network. The VLAN which has the querier (on that switch) must have an IP address to bond to. The querier will handle the connections, known as subscriptions. 

Additionally, every switch on the network must have IGMP snooping enabled (including WiFi access points). If any switch doesn't have it enabled, the muliticast traffic will be broadcast out of every port on that switch.

A couple of things worth noting. 1) Only one of the switches must have a querier. 2) Almost all "managed" switches will have snooping, but very few domestic switches will have a querier.

Cheap switches known to have a querier, Aruba, MikroTik. Both require some level of networking experience to configure. Check the model does what you want before purchasing. 

Some good news. Because Sonos is only using a few Mbps, you will likely get away with simply hard wiring all of your speakers and letting it flood the network. (I get where they're coming from by saying hard wire one and let sonos use its own network, but you're still likely to overwhelm it.)

Scott,

I’m running Cisco 2960 and 3850 on my network.  I have only wired the sound bars (3 of them). I have sonos and smart TVs on separate VLAN.  I turned on IP snooping and DAI today to test on this VLAN.  

The sound was very bad today during the super bowl. But you’re saying to wire everything (about 32 sonos speakers) and flood network?  This is contrary to everything I’ve been told.  Can you elaborate on this advise?

Thanks