Uncharted 2 - Freezing...

This just happened recently. I've been playing Uncharted 2 multiplayer for about a month or so and this is the only time that it's ever froze on me - one time while it was loading the start up screen (with the dagger symbol in the lower right corner) and one getting into a Deathmatch game....I've had to force my PS3 to shut down twice (the screen would just go black/blank)and the freezings happened within one hour of each other. Is my PS3 about to YLOD or what? :X