I can't play for an hour without it shutting off all of a sudden.
Maybe it broked?
Pimp slap it.
Show it who's the boss.
Maybe Pistol whip it a few times, too.
Sounds like it's overheating. Put it somewhere with lots of airflow or something.
Use compressed air to clean out the vents.
How much air is it getting?
I suggest sending Nintendo very angry e-mail with a lot of angry faces like this >: (