*2016/9/2 update
We have just release the patch version 01.01 to fix this issue.
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We heard that some people reported crashes during online co-op play. We found that the issue tends to happen when a microphone is used during online co-op play.
We are investigating the issue now so meantime please do not connect a microphone to the PC port during co-op play for the time being.
Thank you for your support.