PS3 has more bugs which are fixed in PC version. Constant audio crashes (radio and some sounds not playing) and mixed radios restarting from the beginning were really annoying.
PC has audio issues too, at least in multiplayer on rare occasions after lobby transitions/changes. Radios break and vehicles don't make any sounds making you restart game.
Yes, on rare occasions. And very rare in SP. Not every 20-30 min of play.