dsi console keeps turning itself off

"The first place to start with the amount of information you have given is checking to make sure the battery is an official Nintendo battery, that it is properly charged, there is no residue on any of the contacts (battery and connector) and that the battery is securely seated. It seems that the battery in a DSi has enough extra room in the compartment where it can move from making the best contact with the connector. I've fixed a number of DSis that would not charge by simply reseating the battery. Nintendo put circuitry in these to detect improper current to help prevent 3rd party batteries from being used.

Please tell us more about the lights (LEDs) during normal operation, when it shuts down and when charging. Also is this happening only with game cartridge games, downloaded games or both? Does this happen when an SD card is inserted? Are you sure it is random - If one of the shoulder buttons has a short or any button, the system may shut down when it is pressed."