If you experience any issues with your LG MS323, You can perform a master reset or factory reset to solve kinds of issues.
please back up your important data (contacts,photos, and etc)
LG MS323 master reset Guide:
1. In status of power off,
press power button + volume down button and hold
2. When you can see LG logo, release power button only (hold volume down button
3. And press power button again in 3 sec and hold (hold volume down button).
4. Select ‘Yes’.
5. Select ‘Yes’.
6. Reset processing..>
Reboot, Now, You have reset your LG MS323 to its factory defalt settings.
Wish this helps!