I’ve been listening to Spotify since purchasing my Beam and OneSLs several months ago. Last week, Spotify started complaining that my wifi was unstable. All other services play fine.
I’ve forwarded a diagnostic (200988785), and verified nothing is blocking between wifi hub and Sonos.
Try unplugging your Beam and One SLs from power for about a minute and reboot your router and phone. You can also try removing Spotify from your music services in the Sonos app and re-adding it.
I did all that prior to opening a ticket. I’m quite curious what the diagnostic says.
Thanks for the help!
On a whim, I tried a restart again. This time, I stopped them in order (Beam, SL-Kitchen, SL-Office) and then brought them back online in the same order. Voila! Spotify works a charm, and Sonos now starts music faster (previously, the delay was occasionally over a minute).
Thank you 
GuitarSuperStar
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