How to do if the software disappears without reason after installation?

Solutions:
1. The installed software can not be found. Search the software through global search. Operation method is: home screen-> > search-> >enter the app name.
2. The software icon is lost and the mobile phone desktop cannot be found, so empty the home screen data of the system. Settings>>Apps>>Manage Apps>> System launcher>>Clear data.  Before clearing the data, which will cause the home screen layout to be disrupted.
3, Check whether it is a stable version of the system forced to obtain the ROOT permission, which may cause instability of the system, it is recommended to close the ROOT permission, re-install the lost software.
4. For Redmi mobile phone series and some Mi phone models, external SD card can be installed. If forcing the software to be installed with external SD card, the software may be lost due to system abnormalities. It is suggested to install software in the ROM of the phone.
5. It is advised to restore factory Settings after backup.