I’ve had a Sonos One set up in my kitchen for a good few years and it’s always worked fine when I play Spotify tracks via my phone.

But recently, when I play a track, an entire channel / audio pan is missing (e.g., I play a rock song that sounds fine on my phone - guitars, bass and drums, but when I play through the Sonos, the guitars are completely missing - it’s just bass and drums).

I’ve tried resetting, changing the EQ settings in the app, etc., but nothing works.

Any ideas?