I have 7 rooms with Sonos speakers. One has a playbar that is wired directly to my Deco M9 router (one of 4 in a mesh network). I play Amazon Music service and all is well. I play Spotify and I get:
2) Songs skipped because it cannot play.
3) Long delays when we add/drop rooms.
4) Left/right/sub speakers dropping out and coming back during a song.
I can play 4K movies, day in, day out so I do not believe it is a bandwidth problem. I have gone back to using SonosNet (removed password for my WiFi) but this did not seem to change anything.