why does my xbox automatic shut off?

This behavior occurs when the internal temperature of the console exceeds the acceptable limits. You may think of this as too hot, overheating, and so on.

You should get a new powerbirick if it continues after you have left it unplugged for a while. I don't know bud.

Here are Some Steps:

1. Let the Xbox 360 console cool.

Note You may have to wait several hours for the console to cool enough. Do not turn on the console when the console is hot.

2. Verify that the console has sufficient ventilation and that the fans are operating. For more information about ventilation, see the "More Information" section.

3. If the two lights continue to flash red after you try steps 1 and 2, contact Xbox Customer Service

If It's 3 red lights It's usually a loose cord connected either from the xbox or the component cables, it might also be that the xbox is overheating just leave alone for a while and check again..

it is most likey overheated and got real hot thats why its flashing red it is warning you to let it cool down try lay it down next to a air con or somthing or it could be faulty hardwear try to take it in for a check or if you brought it new and havent had it for over 1 yr get a new one from microsoft they will also give you 1month free membership

Send it to Microsoft or either you find ways on YouTube how to fix the red ring of death.

Because all xboxs are **** and unreliable