OK, so let me tell you wy I am still not happy with Poly.
I use it for Tidal streaming almost exclusively. I have a bunch of hi-res files on its card, and sometimes play them, but it's rare.
I used 5 apps for that purpose so far: BubbleuPNP, AKConnect, mConnect and a couple of times MPDroid/MALP which I did not like, sice they don't do what I need. mConnect I use on my iPad as well.
When using Tidal, no matter what device I use as a controller, I usually need to restart it a couple of times (the controller app, that is) in order for it to see Poly as a renderer. mConnect seems to be most successful in finding it, and it seems to work better on iPad. I paid for 2 licenses then. Insignificant compared to Poly's cost, but still.
The main issue is that no matter which app I use, after the screen goes down it takes one or 2 songs usually for Poly to stop playing and disappear frm the app as a renderer. I need to restart the app, sometimes to restart the phone, sometimes to restart the POly to make it work again. If I keep the screen on all the time, it seems to play just fine.
And it cannot play gapless, no matter what I set up in mConnect.
I have noticed, that Poly gets lost a lot easier and more frequently when I use my phone's hotspot, that's the reason I use mobile hotspot now when I want to play music via MojoPoly. And I use iPad to control it, because I when I move around the office with the phone MojoPoly gets lost instabtky and I usually need to restart all devices again, so ipad seems to be a sort of compromise.
It doesn't matter if I use my mobile hotspot or my home wifi.
Poly has latest software. And it's a huge progress, since previously it would not connect to my home wifi, neither to my phone's hotspot. I mean it would, but only occasionally.
It's a LOT better then it was just after the release (and I preordered), but still not quite the experience I was looking for I must say.
So there it is. And I'm quite certain there's nothing that could be done about it, even if Matt gets [ersonally involved

Maybe the next update (or the one after it) will help.