Now I can't remember the last time this actually happened to me. Maybe it was bad luck, maybe poor planning. Anyway, I set up a Reyna city with Com Hub and harbor and lo and behold: a spot for the Zimbabwe wonder. I rarely build this one but people here are always raving about it so I figured why not. I gradually move my trade routes to that city but then, dispite having a spy on the hub, I get siphoned, for a lot. Before I know it units are getting disbanded left and right, starting with the spy on the hub. I move my other spy there and the turn it gets there it also gets disbanded. No more defense against the spies siphoning me. So yeah, that was a rage quit on a game that went from a sure win to falling apart in about ten turns. Maybe declaring war on all the civs I had traderoutes with so I could spread them out again would have helped but I was just too annoyed. Moral of the story (I guess): don't put all your eggs in one basket.