I also experience this problem. I lose my connection and get the 30002 error and 13003 error while logged in, not trying to log in like some people have claimed. I have done the port forwarding, reinstalling, ect ect. This is not specific to my ISP nor to any of my computers. I have this computer and another both having FFXIV and FFXI installed. I run both games simultaneously and will ONLY lose connection on FFXIV regardless of which computer I'm on. At no time do I ever lose connection to FFXI or the internet on my third computer. The one computer is a two year old Sony running Windows XP Pro and my Alienware runs Windows 7 and only 5 months old.

I hear online of tons of my people who experience this issue but will not report it because they're all of the mentality that SE will do nothing about it. As a person who has played XI since the start and now XIV, it is frustrating that the moderators do not take some of these issues as seriously as they should. Loss of connections are not only frustrating to the players, but it absolutely destroys the pleasure of the game. You can't enjoy anything when you know you're just going to be frustrated and annoyed every little while because of a little error.

I'm a Quality Engineer at my day job and I've come to learn that it does not matter how many bells and whistles you implement, if the system doesn't work correctly to enjoy it, it's still junk.