well i bit the bullet last night and put mine on, i plugged the lead in so i was connected and i completed cod4 on single player, after that i checked and still ok so i had a blast online with it, again still ok, im going to check again today, one thing i did notice is that cod4 wasnt as busy as it had been and you could actually get a game, seems lots have been banned or are staying away from cod4, i think it probably has more to do with pre releasses being played or halo3 ( strange it was released early in the shops wasnt it, funny thing is i know no one that actually got it early from a shop, could it have been a rouse to get all the modders to chuck theres in thinking it was safe to do so?)
anyway the log shows nothing unusual so its not firmware related, so it is disk related (or specific game related) or something else we dont know about but it cant be fool proof as not everyone has being hit.