Please try the following:
1. Clear all background apps.
2. Restart your phone and try again.
3. Change the network environment or switch to a different WiFi or data network. Ensure the network is stable.
4. Try downloading music in other formats.
5. If using a third-party music player, install a music player app from a different party, restart your phone and try again.
6. Uninstall and reinstall the player.
7. Ensure your phone's system is the latest.
8. Back up any important data and restore your phone to factory settings.
If the issue persists, contact the Nothing Support Team for further assistance.