Why does the game keep freezing on PS4

the characters freeze, doesn't matter what you doing, when the game chooses to freeze it'll freeze your stuck trying to click through Sim characters & they are all stuck standing or just moving in one spot very fast but can't chose to do anything nor move or switch between characters once you can, switch, it freezers it & freezes again on the new character you choose I notice when you go build & buy mode & back onto live it starts freezing hard than.