Sometimes when i first go on MW2 and search for a lobby my PS3 Freezes when im in the lobby and where it normally says intermission it just says waiting and the music just cuts out ( using turtle beach p11 )

Other games work for fine for me though when this happens

This has happend twice. 2 days ago and about 2 months ago. i just leave my ps3 off for a while or disconnect it from the mains and usually it works again.

Try cleaning ur disk as well as it might just have scratches on it