Ive got no where with sony or PD so i'll ask here. Sometimes after I play the game for 45 mins to an hour my PS3 starts making a knocking sound and the game locks up then the screen goes black. I have to eject the disc, shut off the power from the back of the machine and restart everything. Sometimes I can put the disc back in and play for hours and sometimes it happens again within an hour. The odd thing is this never happens with any of my other games. I could go 3-4 hours on COD without a problem. I can leave the machine on all nite downloading from the sonystore without a problem. I can watch blu-ray after blu-ray movie without this happening. Just wondering if anyone else has had a similiar problem and how did it get fixed?