I got this issue and it's very annonying. Whenever i try to join someones session in zombies, my whole ps3 freezes. Any suggestions about why this is happening? It works perfectly fine in Multiplayer.
MY PS3:
CFW: REBUG 4.78.2 D-REX
EBOOT: DEBUG SPRX EBOOT with t6mp_ps3f.self
Game: BLES01717 - Black Ops 2