New error game seeming to pause midgame

During the the last couple games upon attempting to onboard some new people to the game, a weird glitch started to occur, for the two games it appeared to crash, although i say crash it was more of a permanent pause as menus could still be call called up and move markers on the ground still displayed, so the program was still running. We also noticed a weird occurrence wherein it would show "observers" in the scoreboard right before crash. Upon looking at the logs it appears maybe it was because an individual disconnected, could someone confirm this for me? gamelog.txt

warning: SND: XACT3DApply failed.

looks like surround sound, turn it off, go to stereo