Please follow the below steps:
1. Clear all background apps.
2. Restart the phone to see if this can solve the problem.
3. Try again after changing the network environment. Confirm whether the network environment is good. Switch to a different Wi-Fi or data network and try again.
4. Try to download music in other formats (may be related to the format compatibility of the music).
5. If you are using a third-party player to play music, you can install other apps of the same type, restart the phone and play it again to see if it can be solved. Or try to uninstall the player and reinstall it.
6. Check whether the mobile phone system is the latest and upgrade if not.
7. Back up phone data and restore factory settings.
If the issue persists, contact the Nothing Support Team for further assistance.