WaW Zombies Crash (Vanilla Maps, no mods)

[Bottlebone]

Zombies will always seem to crash after a certain amount of time, like a few minutes, no matter which of the 4 maps I'm playing. I'm playing solo btw. There's no console error, it'll just back screen and keep playing the sounds that were already playing. The crash isn't fatal, I can still open the console and disconnect myself that way. Is this just an issue with the client?

Things I've already tried:
-Windowed, borderless (Always had it that way)
-Turn off Specular Maps
-Turn down Corpse Count
-Search for an existing solution

Everything is installed correctly, I keep the client updated, I use a real WaW copy on Steam. Campaign and MP are fine, just Zombies does this.