What is the screen lock and how do I disable it?

This feature locks the buttons whilst in play to avoid accidental operation. The device will lock after 5 seconds of inactivity. To unlock the device, press the bottom left button.

To disable the lock screen navigate to the 'Settings' menu from the main menu, scroll down until you see the 'Lock' option and enter this, finally highlight the desired option and press the top right button to confirm the choice.