I am having the exact same issue. The game ran fine for years on my old Windows 10 machine, running on an i7 and 1070. However after upgrading Windows 11 with a 9800X3D and 4070-Super the coop missions always lags out and eventually freeze during cutscenes (basically whenever an NPC dialogue box pops up). This also forces me to restart my PC as I cannot close, minimize or tab out of the frozen game window, which is stuck on top of everything else, including task manager.

I'm also having this issue since upgrading to windows 11.

game_24419832.log

Also the game regularly freezes up during coop missions/campaigns and I'm unable to close or minimize the game window to use task manager, forcing me to restart the computer or else be stuck on a frozen FAF screen forever.

game_24419924.log