Game Crashes Ever Time I Complete A Mission On Sanctuary

I’m playing in 3 player coop. And the game crashes every time when I complete a mission on Sanctuary. My hardware specs are exactly what is recommended. It really annoys the shift out of me cause the other two players are getting the mission rewards xp and items. I don’t, but the mission is “completed”. I already tried all kind of graphic settings, from highest to lowest. Vsync On and Off. As soon as I complete the mission the game crashes.
No way to get the item or xp. Any tips, tricks or fixes for that?