The troubleshooting steps you've tried so far are very good. We'd like to add a few more. If you're using an SD card, you can remove it, reinstall the app and then try running the app without the SD. Does this issue persists?
If you use any battery optimization or power saving apps, it's a good idea to deactivate them for Spotify.
Let us know how it goes. We'll be right here if you have any questions.
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