Thank you for your help! That wasn't the problem directly, but it led to the solution. I actually feel embarrassed because I should have realized I could clear the data along with the cache, because everything's on Pandora's servers. Anyway, after I cleared the data, force stopped it, then cleared it again and restarted, it played for about 2 minutes and crashed. But this time when it restarted, it had a prompt asking if streaming stopped, and a few things to try, with a settings button for battery settings. After I enabled "Allow background activity" under "Manage battery usage" in the Pandora app settings, it's been playing nonstop! Thanks again.
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