Why does the sound of Android phone suddenly become smaller?

If the vivo used is a mobile phone, that is to say, the volume of the mobile phone is automatically adjusted, you can refer to the following processing methods:

1. If you enter the settings-sound and vibration/sound, mute key and vibration-and turn on "Earphone Hearing Protection", when the earphone volume is too high, if you connect the earphone again, it will automatically decrease to a safe volume;

2. Observe the place where it is placed to see if it is easy to touch or rub the volume button or mute button by mistake;

3. Remove the protective shell and confirm whether the volume key is touched by mistake because the protective shell is not suitable in size;

4. Check whether the Bluetooth headset or other equipment is connected, which leads to the adjustment of the volume;

5. Enter the multi-task switching interface and click the "X" icon to clean up the background tasks.

6. Restart the equipment;

Restart the phone/tablet:

1), press and hold the phone power button to pop up the "restart" option to turn it off;

2) Slide down the top of the mobile phone screen twice to bring up the shortcut bar details page/slide up the bottom of the screen to enter the control center, and click the "shutdown/restart" switch;

7. Enter Settings-System Management/More Settings-Backup and Reset/Restore Factory Settings-Restore All Settings-Restore and Restore Settings Options.

This operation will not delete the software or files; It will only reset all setting options; For your data security, you can back up important data before operation.

Note: Enter Cloud Service-Device Cloud Backup-Backup Data Type-System Data-Back-Back up some backup system settings and desktop layout immediately; Cloud service-data synchronization-turn on WLAN and Bluetooth to synchronize data to cloud service.

If you have more questions, you can go to this link page to consult online customer service for details.