I would be glad to help. It sounds like your phone may have an unstable internet connection, or Google's App store has an unstable connection. Are you able to install other apps on your phone? Also if you follow these steps to reinstall the app:
Does Pandora have the option to "Install" or "Enable"? This determine if the app was uninstalled or simply disabled.
Once you are able to answer the questions from my previous post, I would be happy to solve this issue for you.
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