Please follow steps below for troubleshooting：
- Close all apps running in background by tapping recent apps key and Clear all.
- Perform Boost：Slide down the screen from upper area to access Quick settings and then tap Boost.
- Reboot your tablet.
- Clear cache of apps：Settings > Apps > (select an app) Clear cache.
- Uninstall apps that are not often used：Settings > Apps > (select an app) Uninstall.
- Update apps to latest：Play Store > upper-left menu icon > My apps > UPDATE ALL.
- Update firmware to latest version：Settings > About > System update > Check Update.
- Re-install apps：Settings > Apps > (select an app) Uninstall and then re-install it in Play Store.
- It is recommended not to use your tablet while it is charging.
- If there is weak Internet connection on your tablet, it may cause crash of apps that need good Internet connection
