Hey @Stacychaviss - Thanks for posting!
Let's try start with some standard troubleshooting steps to see if we can resolve this. First, if you haven't already, make sure your internet connection is working properly:
Try connecting directly via an Ethernet cable rather than using Wi-Fi (if you have this option), and see if it works better.
Try rebooting your modem and router and restarting the device.
If that doesn't help, let's try uninstalling and reinstalling the Pandora app. Note: you'll need to be signed into your Xbox Live account.
Go to My games & apps from the home screen and highlight Pandora from the list of apps.
Press the menu button on your controller.
Select Uninstall.
Choose Uninstall all to confirm that you want to uninstall the app.
Then, reinstall the app:
From Xbox's Home, go to Store and either select Browse apps > Popular music apps or search for Pandora to download the app.
When the download is complete, you can find Pandora again in the My games & apps section.
Let me know how it goes.
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