I have a Galaxy 8 and am having the same issue. I also have a Galaxy 9 for work and have no problems.
When I listen to my personal phone (Galaxy 😎 I get to hear one, maybe half of two songs then it just stops. This happens in Offline Mode, live station, etc...doesn't matter. But when I plug the phone into my car and use the Android Auto it will play until I turn it off. Obviously it's a glitch with the Pandora program and Galaxy 8 software...please fix.
I moved your post over to the Android section to keep the community space organized.
This issue may be related to your "Sleeping Apps" setting, which is causing the app to stop / pause when it is backgrounded.
Please try out the following steps:
You can access this setting in the DeviceCare menu.
Click on Battery, and then, click on More options.
Click on Settings > Sleeping Apps
From your Sleeping Apps, you should be able to long press Pandora. Once you're able to view the App Usage for Pandora, you'll want to make sure that the put app to sleep button is toggled to the OFF setting.