I know it sounds simple, but it's often overlooked. Could you try restarting your device? If that doesn't help, try a quick clean reinstall of the app. Just follow these steps.
Make sure Spotify and iOS are up to date. I'd also recommend using the Sign Out Everywhere and Remove Offline devices from your Spotify account page to see if that helps 🙂
If you're still having trouble, could you let me know the exact version of Spotify and the exact version of the operating system you're running?
I'll see what I can suggest next!
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Note: I'm not a Spotify employee.