Follow these steps if the App Toolbox is displaying an error message which is causing your phone to reset itself.
1. Restart the device.
2. Once it reboots, tap and hold the App Toolbox icon (widget).
3. Select App info > Storage > Clear data and cache.
4. Scroll back and select Force stop.
5. Finally, reboot the device with the power button.
Tip: Complete these steps as fast as possible as the device may restart itself during the process. If this happens, start the process over and try again.