Jin Li's mobile phone often becomes silent. What happened?

Mobile phones often go into silent mode. Try the following methods:

1. Check whether the phone is turned on in Do Not Disturb mode (or Do Not Disturb mode): Settings-Sound and Vibration-Do Not Disturb-Slide Close (some machines support this function).

2. Check whether the third-party ringtone software has been installed recently. If so, it is recommended to uninstall this kind of software.

3. Upgrade the mobile phone operating system to the latest version. Note: Please back up the data in the device before upgrading.

4. If it is the latest version, please back up the data in the mobile phone, and then try to restore the factory settings.