Make sure you perform a clean reinstall of the Spotify app on your device since this will remove corrupted files from the previous installation which could cause this. Check out this help page in order to find the steps for clean reinstall on the affected device.
Tip: Once you’ve performed the clean reinstall you'll need to re-download your offline music and podcasts.
If the clean reinstall doesn't do the trick, try disabling any power saving or data cleaning settings on your mobile device. Alternatively, you can try authorizing Spotify to run without restrictions despite the mentioned settings being enabled. Make sure you try this since such features can often prevent the app from operating at full capacity.
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“Music is the strongest form of magic.” Marilyn Manson