Naturally, this is pretty bad as Mass Effect 2 is a sprawling 30-hour RPG epic. Bioware says it's aware of the problem and hopes to have a patch submitted to Sony as soon as possible. Until then, the developer reckons restarting the game every few hours should help you to avoid the nasty bug.
And is the co-op local or online?
Microtransactions coming back for costumes
It's almost identical
"All I've got is support from EA"