I seem to have the same problem with the network error sign coming in intermittently.. the lights in the back at ethernet port are flashing and I restarted the router and switch and lumin etc..
it was working but at times I was losing control from the app or the song would drop out and jump to the next one in the playlist.. now it’s not showing up at all on the app and there’s just the circle on the front display but I have no control..