I just bought Xiaomi 5 mobile phone. What's wrong with text messages without sound?

The reason and solution of Xiaomi mobile phone suddenly answering the phone without sound;

1) The first possibility is to turn down the volume button or mute it accidentally. In this case, this problem can be solved by adjusting the volume in the settings-voice and vibration-volume-voice call volume.

2) In the second case, if the system or installed software is upgraded and there is no sound when answering the phone, you can uninstall the latest downloaded software to answer the phone normally because of software conflicts.

3) If uninstalling the software can't solve this problem, you need to restore the factory settings, back up the data, and then click Restore Factory to solve this problem.

4) If the mobile phone still has a warranty, it is best to get it for after-sales inspection to see if it is a software problem or a good hardware problem.

5) If the phone is out of warranty, try to plug in the latest system.