I have a Bose Soundtouch 20 on which we have played Pandora for many years. Yesterday when we tried to play Pandora, we got nothing but static. Pandora works fine on my iPhone and iPad, it is only an issue on the Bose, which is our main source of music. We live in Green Valley, AZ. Unfortunately I misplaced my operator's manual or I could probably find the solution there.
Thank you for your post and welcome to the community!
I'm sorry to hear of the issues you seem to be having with Pandora on your SoundTouch 20.
Have you tried removing Pandora from the SoundTouch application? You can remove this in the settings menu under Settings > Music Services.
Let me know how you get on!