[Help - Other] Crashing during challenge quest?

[Acid Rain]

Hey,
I've been playing challenge quest recently with some friends and I always seem to crash quite a lot whenever I'm playing usually on the 4th or final round, just wondering if anyone knows what's causing it?

[Jetman]

I'd need a dmp or mlog to tell ya.

[Acid Rain]

I'd need a dmp or mlog to tell ya.

This is my mlog D:
http://pastebin.com/RK96DLZY