When someone separates from the party ( Crossing to the other side), There is a chance that whoever crosses client to be forced closed. I've ran multiple times on my DRK while my party has a SED Mule and lately my client just freezes and shut down. I assume that i'm not the only individual who has had this problem recently. I've mentioned it to @Gert before and he suggested that i re-downloaded the files but that didn't seem to fix nothing at all. Please look into this when anyone has a chance.
I used to have it aswell in the previous patches. while sometimes I still crash when I cross, weird stuff.