Hey there, @nrubgalbderaj. 👋
Please try out the following steps on your Samsung Galaxy S9:
You can access this setting in the Device Care 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.
++
If you still have trouble, please try running through the basic / advanced steps for your device. They can be found here.
Let me know how it goes.
... View more