Samsung a8000 mobile phone card 2 ringtone setting, changed to default ringtone after exiting. What happened?

The following actions are recommended:

1, restart and try again;

2. Check whether the mobile phone has a system push notification, and if so, update the mobile phone to the latest system version.

3. Observe after uninstalling the recently installed third-party application.

4. Back up data (contacts, text messages, photos, etc. ) and try to restore the factory settings.

If the problem still exists, it is recommended that you take your mobile phone, purchase invoice and warranty card to the local Samsung after-sales service center for testing.