Uggh my Wii is acting like an idiot.

[Waker_Of_The_Winds]

I can't play for an hour without it shutting off all of a sudden.

[sonicdude164]

Maybe it broked?

[Redpaige13]

Pimp slap it.

Show it who's the boss.

Maybe Pistol whip it a few times, too.

[Silverhawk79]

Sounds like it's overheating. Put it somewhere with lots of airflow or something.
Use compressed air to clean out the vents.

[WiiGuy]

How much air is it getting?

[phatyo]

I suggest sending Nintendo very angry e-mail with a lot of angry faces like this >: (