I've got the same problem - have had many long conversations with sonos (whose customer service is amazing) and they have said it is now a documented problem with the superhub 3. I have a one songs wired in - but on the other side of my netgear switch, and that most of the time is fine, but I do frequently need to reset everything. I was thinking about getting another router and using the superhub in modem mode only, but there are threads that say there are problems trying to do that too. So I'm at a loss and hoping that someone gets this sorted.
Apologies to you both for this issue, of which I was personally unaware. I do know that using modem mode isn't a viable option currently as there are disconnection issues currently under investigation.
I'll see what I can glean from the firmware team on this Sonos problem and shall get back to you.
If you don't hear from me by Friday feel free to post an update request on here.
Hi guys I had the exact same problem but managed to resolve it... What you need to do is log on to the router by going to http://192.168.0.1 log in to the router then click on advanced setting then security what you need to do is change the setting so both 5g and 2g are not the same name so if you have somthing like vm5656676743. Change them both to something like vm5656676743-2g & vm5656676743-5g that and take the channels off auto. You will to download a smartphone app called WiFi analyser and check for a clear channel and select one that is clear. Save your settings and try to set your sonos up again and it should work this time.....let me know how it goes.
I've been advised that the 9.1.88T f/w should definitely resolve this issue. It is linked I think to the problems with Chromecast 1. As you both now have that f/w version I'm hoping this is no longer an issue for you.