I figured out how to fix my last demo problem, but upon solving one, I've reached another. I had some help, and even they say they don't know the problem to this one.

 

Once I get about half way through my demo, it freezes, then brings me to an error screen that says "Lost connection to host" - I'd really appreciate it anyone knows how to fix this

As far as I know, there's no fix for this. Recording shorter demo's usually helps.