I've had this problem for over a year with multiple PS3's with a few different games.
it's the power supply getting to hot, and the GPU is trying to pull more power and the power supply is basically not supplying what it should be, so the gpu locks up.
Happened with my PC before I upgraded my power supply, but you just need to keep your PS3 cool. maybe move it to a cooler spot in the room, don't keep it under the TV in a case, etc
forgot to mention that with every update, there are hidden things $ony adds to the background processes table. that or they just break the system little by little.
world domination? I think so.