Changed ISP, Spotify searches, but no longer plays tracks

Had no issues with Spotify and Sonos for over a year up until this point. It's worked great for me and I really enjoy it.

I recently changed my ISP. Now I can't get my Sonos system to play any Spotify tracks.

I can see my playlists and even search for new music on Spotify through my Sonos system. But, whenever I try to play a song, I get the dreaded "Unable to play - the connection to Spotify was lost" error. : (

Spotify streams music to my desktop application fine, so it's not being blocked or anything. I've reset my controller, hoping that new DNS/Gateway/etc info needed to get propagated. But no dice. (Again - I can see playlists and perform new searches form my controller. Just can't stream.)

Any help would be appreciated. Thanks in advance.