@JezinUplyme 
The Spotify service is playing direct to your speaker when playing through the Sonos App - so it’s possibly having connection issues to the local network. It’s not clear what troubleshooting you may have done already yourself, so here’s a few questions…

• Is it wired/wireless?
• Does it connect to your router or a different access point?
• Are any other Sonos devices wired to the router?
• Have you tried rebooting the router/speaker?
• Have you tried a different WiFi channel?
• Does it work if you bring it nearer to your router?

Thanks Ken - i will work through those suggestions and see what happens. 

Ken,

I've had some success so far by following your suggestions:

I removed my Beam device from the router which was hard-wired directly (something I did some time ago but had forgotten about!). The Beam is now wireless.

I powered the router off/on.

I powered the Play 5/gen 2 off/on.

I powered my Samsung S7 off/on after force-stopping the Sonos app.

So far so good! I can now stream directly from the Spotify app to the Play 5 or run Spotify from inside the Sonos app. Been running for 15 mins now without any problems - fingers crossed!

Thanks alot for your time.