Hello,

I have been playing co-op with my brother, with myself as host. My computer's a high-end newer rig, so everything should be updated, etc. I haven't had issues for most of the game, but now we're doing side missions for the demons, and my game is getting random pop-ups mid-mission with frequency. The pop-up says they're sorry for the inconvenience, but we have to close your system, and then it closes completely. We are able to get through a mission or two, but then it crashes again.

Any idea what I can do about this?

Same thing is happening here.

Have you tried using only one monitor if you have dual monitors?
Have you tried windowed fullscreen?

I'm gonna try these and see if it helps.

I've actually just changed "Windowed Fullscreen" to just "Fullscreen" and it seems to have solved my problem.