If you are experiencing lags, freezes, non-responding/buggy issues with your Cruz, the here are the steps to do a factory reset so you can resolve those issues.
From the Home screen > Menu > System > Privacy > Factory data reset > Reset Device > Erase everything
The device will shut down and perform the software reset to factory settings, including erasing the internal flash storage. Upon restart, the device will require you to again go through the Cruz Setup Wizard to configure your Wi-Fi and Email, just as you did just after purchase.
This process won’t delete the microSD card contents, but does delete the internal flash storage.
For the T400 series, a factory reset is performed from the System Recovery menu. Follow the steps 1-3 listed below to reset your T400 series tablet.
3.) In the System Recovery menu, use the volume toggle to navigate up and down through the menu and hightlight your selection. Use the power button to activate your selection. Select the option that corresponds to clearing cache and data. Once completed, select the option to reboot your device.