Me too i had problems from the days of COD : BO And i dont even own the game.
Its seem really weird, like sometimes it work great, other it'S A MESSSSSSSSSSSSSSSSSSSSSSS. ( right now now )
But i just got a PS3 Slim, but before COD - BO day, it was find going on PSN and all. I even manage to re-download all my dlc ( maybe my network card died ??? ). And i didnt had probleme with my Old Fatty ps3 !
Or maybe it's really just COD - BO that slow down and mess up PSN ???? Too much people playing ???
I Got a PS3 slim version, from Canada ( maybe psn regions do somethings )
But i got Norton internet security too and it seem that it block my ps3 sometime. Other people here got norton antivirus ? maybe it's a update from them that block ps3 ???
PLEASE TECHNICAL SUPPORT LOOK HERE !!!!
Maybe i find a QUICK FIIIIIX !!!!!!!
Change the channel of your wireless routers !!! I just did that and now PSN is fffffffffffffffast connection wouuuuuuuuhouu !!! ( or maybe less people play COD BO right now ? ) xD
Edit : Weeeeeeird that wifi channel got mess up Maybe 2012 is too close and magnectic got all mess up ( lol )