switch-off

Hey there,

I have a serious problem with my graphic card.
Either I or a member of my team I am watching (cuz I am dead) am close to the exploding bomb or I am in smoke for about 5 seconds my computer switches off. Like I would press the power button. Then I have to re-boot and re-start the game.

I have no clue what is wrong with my computer. It is a laptop from MSI with an ATI Radeon HD5870. I already checked CPU and graphic card temperature but this is not the reason. I have the latest version of the driver.

Maybe someone has an idea to figure it out.

Thank you in advance.
Regards