Hi @ovation, welcome to Community!
Sorry to hear you’re having trouble with Pandora on your Xfinity X1 devices. Thanks for letting us know the steps you’ve already taken, restarting both your cable boxes and Xfinity router, this is very helpful!
Since Pandora is launching but not fully loading, let’s try refreshing the connection between Pandora and your X1 devices.
First, if the Pandora app remains responsive long enough, you should be able to go to Settings > Sign Out, then sign back in with your Pandora email address and password.
If the app freezes before you're able to sign out, then try clearing the locally stored app data on your X1 box:
Xfinity button > Settings (gear icon) > Privacy > Locally Stored Data > OK
Please keep in mind that clearing locally stored data may sign you out of other apps on your X1 device as well.
If you're still having trouble after trying those steps, let me know and I can look into trying and refreshing the connection between your Pandora and Xfinity accounts next.
One other quick note: you may receive an email notification when someone replies to your Community post. If you reply directly through that email, your response will be posted publicly here on Community, so please don't include any personal or account information.
If you'd prefer to continue working with us privately through email, I'm also happy to create a support case for you.
Let me know how it goes!
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