I haven't had this problem myself, but have you tried Uninstaller and reinstalling the zombies pack? I hear that fixes it.

I had the same thing happen to me, couldn't finish a single round of anything without it failing. Before it got that bad I was doing a scan/repair multiple times a day and re-installing the game every couple of weeks.

I guess a big part of my issue were the Nvidia graphics drivers - I rolled it back to 461.92 a few weeks ago and the game has crashed once since then.

Everytime I play a game of outbreak it crasehs or disconnects at some point.. Literally everytime. Am I the only one, and is there a fix?

I literally can't play Outbreak