I am having this same issue, it began about a month ago. We have been using free pandora through our Sonos system for years and were never had a problem with the ads in between songs. Now at least once an hour songs are being interrupted in the middle of the song and when the music comes back in it is a completely different song.
Hi @Kdw
Welcome to community!
Sorry to hear that tracks are being cut off by ads when listening on your Sonos. I'd like pass along your experience to our engineering team. To help gather more information, I've enabled a trace on your account. Could you please, log out of your Pandora account on your Sonos, log back in and continue to listen to Pandora as you normally would.
The next time an ad disrupts a song, please take note of the following to share with me:
Thank you for your help!