Hi @Wheelz
Welcome to the Sonos Community!
Sorry to hear of these issues you are having with the Sonos app.
You mentioned Sky - do you have Sky TV boxes?
The reason I ask is that these TV boxes will repeat a Sky router’s WiFi signal, but in a way similar to WiFi Extenders, which we do not support as they tend to block specific types of data that we utilise heavily.
So, if you have Sky TV boxes, please try this - just for a test period, unplug all your Sky TV boxes from power, then wait a minute or so before opening the Sonos app. Does that immediately improve matters for your Sonos system and the app? If so, the solution lies in preventing your Sonos products from connecting to the Sky TV boxes.
The good news is that just power-cycling the TV boxes will force the speakers to connect to the router instead, and they will stay there until either the router reboots or they do - assuming a good signal strength, that is.
If you were to wire any one speaker (but not one of your Era speakers) to the router with an ethernet cable, that speaker will broadcast a private WiFi that your other speakers (barring the Eras and portables like your Roam) will prefer over the Sky signals - this would reduce the speakers actually likely to connect to your TV boxes down to just the Eras and Roams.
It is possible to disable either the 2.4 GHz or the 5GHz signals coming from the TV boxes, but to disable both, the box would need to be ethernet-wired itself.
Purchasing a WiFi mesh system would mean you could keep the Sky broadcasts separate and you could just use the mesh for your devices, or even just replacing the Sky router with a third-party alternative (if you don’t need the reach of a mesh system) would prevent the Sky TV boxes from repeating the signal (you could configure it to use the same ID and password as your Sky router, meaning that you would not need to reconfigure any WiFi devices.
If turning the Sky TV boxes off does not help, or if you don’t have any in the first place, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports. They will also be able to confirm whether or not your speakers are actually using the Sky boxes for their connections.
I hope this helps.