LAN Disconnects

For some time now, ie Entrenchment days, I've been disconnected from my own LAN games (as in I'm the host). My friends just say I've been disconnected and I have to reload from a previous auto-save, which is annoying to say the least. So far as I'm aware my ports are forwarded correctly, although I'm not sure why this would be an issue on a LAN game. I did a search of the forums but didn't turn up anything helpful that I could see. Any thoughts?