Hi there, not a huge problem I got for you today (since the odds of this happening a lot are not that high).
Friends and I were playing and everything was mostly swell, then at one point his game crashes, but it doesn't say he left my party. Waited a few minutes, nothing changed. He even logged back in and stated he wasn't in the party, so I removed him. The second I did that, my game froze to the point of Alt-F4ing. Happened to my other party member as well. Hope you fellas can take a look into that.
-Wigglezz