X360 - Unable to access MP (crash)

Hi,

When I start ME3, I can sit at the 'press start' prompt for as long as I want without crashing. And can play SP.

If I sit at the main menu, it normally crashes within a minute of finishing Server login/dlc check and if I try to start MP, it crashes in the loading screen at what seems to be the time it normally takes to finish loading.

Is this a common problem, and is there an easy fix?

Or will I have to remove/reinstall MP dlc and hope for the best?