Why does my mobile phone sometimes send text messages without sound?

1, unlock the phone, enter the desktop, and open the setting function.

2. Enter the setting interface and click the notification and status bar options.

3. Next, click the notification management option.

4. Notification management is all applications that allow notifications. Open the application.

5. After opening, if the notification bell is turned on but the floating notification is turned off, there will be a prompt tone when the application has a notification message, but we will not see the prompt message, so it feels like a random sound.

6. The solution is to turn off the notification function, which can solve the problem and close all unimportant applications.