Is it the heatsink there? The thing that says ASRock you are talking about? If so, it might not be the end of the world just now, but without that passive heat sink, its hard to tell if it will cause warping on the MB if it gets too hot or its possible it could trip a thermal sensor. If your computer just randomly shuts off after playing for a while, than it is probably a sensor shutting down your PC to prevent further damage.