Same here since few months.
Sonos devices disappears from Roon few times after rebooting the core (Synology RS3617xs+).
I have to use Airplay.
Raat devices and Squeezebox have no trouble.
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Sadly my fix only lasted for two weeks.
A new version of Roon along with Sonos updates has left it as broken as before.
Considering my next option
So odd, my Sonos kit just trundles along and itās the original z series stuff. One is in the garage on my wireless edge.
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Yes just had another user complain about the same thing in another thread just now.
Pretty sure it is related to Mesh networks and discovery protocol myself. I donāt think it affects that many userās and did not affect me until 1.8 release.
I did a lot of work on getting logs for Roon and working through the process.
I got it all working again for about 2 weeks and it was great and then gone again after the latest 2.0 beta and the latest Sonos updates.
Roon are very aware of this, but not had the time/resources to put any time into debugging it yet.
Hopefully one dayā¦
I have the most basic mesh BT whole home so maybe Iāll fight my upgrade-itis a bit longer 
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To be fair the BT Mesh is pretty good and does not try to be too clever.
I need to find the energy for another rebuild and see how that goes, or get rid of my remaining Sonos and go RAAT only (but that is another 4 zones).
I am already well on the way to that, but itās quite an expense replacing some well functioning Play 3 stereo pairs with a pair of LSX IIās and that is what I think I will be looking at some point in the near future. I then have the conservatory room (2x Play 1 on nice stands) and the kitchen to go as well, though that is linked with a Move and it has Airplay so it makes a good combination.
I would prefer to make it reliable again and take my time on swapping out
I have 2 Sonos Fives in stereo. I experienced something similar last week. I went fully wireless with them. Now, Iām sure these have 3 Wi-Fi antenna. 1 for 2.4ghz, 1 for 5ghz and 1 for 2.4ghz Sonos-net.
My troubles related to mainly the Sonos app as well as Roon. I normally have an external streamer via DAC plugged into one 3.5mm socket on the left Five.
Streaming direct via Sonos app played nothing. Via external streamer, played only from the left speaker. As soon as I reconnected the Ethernet to the setup (right) did it all start working. Iām fairly sure my issues was Sonos related.
If adding the Sonos Boost cured the issues you @Michael_Harris had, then I feel the issue could be Sonos related. It could be trouble with the Sonos backhauling on the same antenna.
The Fives supposedly have 5ghz but Iāve never seen them on it. Even when forced via with UniFi setup menu.
Airplay will work as itās one way traffic.
Many will disagree with me, but my opinion is that these days with streaming speakers, Roon cores and all things internet based you have 2 choices with your network.
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keep it simple. 1 box solutions central to all devices
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complex. Dedicated router, switches and access points on a wired network
I had lots of issues with consumer grade mesh systems. The only one that I found ok was the original Google Wi-Fi 3 puck set. It was better when wired on the backhaul. Freed up Wi-Fi throughout.
Lots of kit and Ā£Ā£Ā£
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It fixed it for only 2 weeks sadly Lewis.
I took the core out and went fully wireless when 1.8 came out as my Sonos were wired and they were highjacking the routing for SonosNet use, when it was 10% of the speed of the Mesh I have in place.
I completely feel this is Sonos caused and initially happened to a number of us after a Sonos update.
I donāt have time at the moment but I will do another rebuild of the Sonos network in the near future and try again
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I am definitely in camp 2 with Orbi Mesh wireless and at least 6 switches full of equipment but for Roon streaming and Plex it is incredibly reliable. But I run a large corporate network for my day job, so I would expect that.
I also think for Roon that RAAT/Airplay/Chromecast is the way to go as they are standardised protocols that are well understood within Roon.
While Sonos is the real market leader in terms of numbers, they want to keep you in their ecosystem, and I left Apple because I didnāt like being forced into a walled garden. I have been a Sonos user since early 2006 and I can see myself getting rid of the rest of it as it is fighting my network and impacting my just press the button and it works music lifestyle
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Yes and I have to do it all before I retire and enter a life of poverty 
1 year and 1 week from now 
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Same here.
8 months and 1 week if work find me another role.
End of January if not.
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I have another 25 years until Iām likely to retire
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Donāt worry Lewis, it will feel more like 40 years
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Defo. I have 3 daughters to marry off.
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Roon should snap you up for the support team given the amount of free work you do on this forum.
It would absolutely be a Busmanās holiday for you 
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Ha! I couldnāt be picky about which of the little darlings that canāt read instructions I decide to respond to then 
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Iām an engineer by trade in the HVAC industry. Helping, diagnosis and fixing is in my blood. Not always correct, but I help where I can with what I can.
Iām a geek and have played (messed) with lots of stuff.
Self learned IT networking, hence my Unifi setup.
Music lover from before birth and have had the luxury of owning lots of hifi equipment etc.
If I can successfully help one person a day Iām happy
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Thatās how I try to take the forums as well.
I pass on many of an entitled post telling us that everything is crap and we need to stop and fix their problems 
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