We started having the same problem this morning. Here's what seemed to work for us: On the Roku Pandora app ... we went to the Pandora settings ... logged out of Pandora ... went to log back in to Pandora ... it gave us a code that expired in 10 minutes and instructions that we used to login to Pandora from our laptop to enter the provided code ... this activated the Roku Pandora app ... when it came back, it's been working ever since.
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