Why does my Huawei mobile phone flash when I click on it?

Did you upgrade the system? If the SMS flashes back after online upgrade, the old version file may remain during version upgrade, resulting in abnormal interface jump.

You can go to Settings > Application Management > Information > Storage > Delete Data > Delete. This operation only deletes cached application settings, configuration information, and so on. , and will not delete the message, will not affect the normal use.