What resolution are you running the game at? The Loading Area is always 800x600 but when you jack-in what are you using?
Basically something is causing your computer to take too long to respond when you jack in and the server thinks you have disconnected.
Are you running over a wireless network connection by any chance? Are you running any P2P software?
Really at this point we're stuck without your system info.
Must read before posting: How to post your System/Network information
In particular I need to see your DXDIAG and MSINFO reports. To put your mind at ease they don't tell us anything that we don't already know that would affect your security.
Just by you posting we can already obtain your IP address, screen resolution, Web browser & version, Java version, enabled plugins, operating system, and machine name. (amongst other things).
As long as you don't post any usernames, passwords or banking details you should be fine.