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Going to need to provide quite a bit more information about your issue OP before anyone can help.
Hey OP. 343 are aware of this issue and the team are investigating. You can follow this thread for updates: https://www.halowaypoint.com/en-us/forums/f0258e8001734968984e8b56990f8daf/topics/hw2-game-crash-after-unit-command/13d0a821-3275-4502-ac65-54f15bf4dff2/posts?page=1