Sometimes in VATS it won't exit after the shots are fired. Its not so much a "freeze" as it won't go back to normal play. The enemies keep attacking and companions continue to fight, but it stays in whatever view the last shot was and continues to go in slow motion. I can't control the player at all. It might be happening when the Mysterious Stranger or the new VATS lady shows up, but I don't remember if it has happened when I didnt have them. I've also had it work when they show up, so its not always when they appear.