Hello,
im having the same problem again too.
i usually host AI Wave Survival on 16 player map. 3 closed 3 bots and 10 player.
As soon i have 2+ Obs to kick and i launch the game, it frezzes and i MUST use crtl + alt + delete to reboot or manuell rebooting the PC via power button. it is absolutly annoying and destroys the complete trust in my hosting abilites and ppl avoid my lobbies from time to time....