Why did the voice of Xiaomi's mobile phone suddenly become smaller?

Taking Xiaomi 10 mobile phone and MIUI 12 system as examples, the reasons why the sound of Xiaomi mobile phone suddenly becomes smaller are as follows:

Turn down the volume

It may be that the user accidentally pressed the volume down button on the side of the mobile phone during the use of the mobile phone, which caused the sound of Xiaomi's mobile phone to suddenly decrease. Users should find the volume increase button on the side of the mobile phone and adjust the volume of the mobile phone to a normal size.

Monophonic audio

It may be that the phone turned on the mono audio function, which caused the sound of Xiaomi's mobile phone to suddenly decrease. The user can open the setting options in the mobile phone, then select the "More Settings" option in the setting interface of the mobile phone, then open the "Accessibility" item in the more settings interface, and then turn on the switch in the "Mono Audio" column after entering.

Mobile phone hardware failure

It may be that there is something wrong with the hardware of the mobile phone, which causes the voice of the mobile phone to suddenly decrease. This is an abnormal phenomenon. Users need to bring their mobile phones, purchase invoices, warranty cards and other documents to Xiaomi's official customer service center for maintenance. If it is not within the warranty period, it needs to be repaired at a certain cost.

This answer applies to most mobile phone models of Xiaomi.