EA tells Joystiq that it's aware of some players experiencing a bug, which appears to stop any further progress, in The Sims 3 for consoles. A representative for the publisher says EA is "continuing to look into it."
InGamingWeTrust has the details on the bug, occurring on both PS3 and Xbox 360, which involves the entire console locking up while attempting to automatically or manually save the game. EA has no details on what currently triggers the bug, or how to prevent it.
If you're experiencing the issue with your copy of Sims 3, it seems the only recourse at the moment is to add your voice to the choir. Check out the video after the break to see the crash in action.