Muso + Spotify Connect - Horrendous Problems!

I've had my MuSo for a few months. I've always had a few minor issues in my partner being able to share the device. She has an Iphone, I have Android devices - I don't know if this has anything to do with it. When I've used it and stopped, she won't be able to see it in her Spotify menu. I have to turn the unit off and on several times before either of us can see it via Spotify connect again.  It was mildly irritating to say the least.

Recently this problem came to a head when nothing I did would result in me being able to play via the device. 

I factory reset the unit three times, I factory reset my router, I uninstalled Spotify from all my devices including the PC, I uninstalled the Naim app from everything and started from scratch.

Still the same problem. 

If I turn it off, unplug it and start up and it defaults to Spotify input, the large round light around the control dial pulses (what does this mean?!).

If choose a few other inputs via the Naim app and come back to Spotify, the "Spotify" light starts to blink on and off (the ring stops pulsing and stays on) - What on Earth does this mean?! Helpfully there is absolutely nothing in the manual that sheds light on what blinking icons or pulsing rings actually entail. 

I can see the device in Spotify Connect. When I try to play via the speaker it simply says "connecting" for 10 seconds or so and then returns to saying "devices available" 

All other inputs work fine. Tidal is perfect, even Spotify via Airplay is problem free. Is this a problem with Spotify Connect? 

I'd like some help or insight as to what I can do to sort this, because right now I'm very close to throwing it off the top of the building!

Thanks in advance