Game stops letting me build, play or save

If i delete a wall, it seems to choose random ones everytime, the game freezes. But not in a normal way where nothing happens. I can still look around my build, go to live mode. But the sims have froze, every time i build a wall or place a object it dissapears. Everything freezes but it's not like my computer is doing it as you can still look around and press on things. If i press save to try and save my progress at least, the save icon just keeps going and never saves the game.