For any of you having disconnection issues who are using a Surfboard SBG6580 Gateway Cable Modem, or using ANY cable modem that has a built in router, here is how I fixed my disconnection issues!
First off, when running a traceroute or ping -t to the game server, I was getting terrible packet loss, and my connection was being routed through telia.net servers along the way. I was literally getting disconnected from The Secret World every 2-5 minutes, and would get the Lost connection to server, would you like to reconnect message over and over.
Here is my solution.
My router had a setting called RG Passthrough, when enabled, turned off NAPT mode and disabled the router portion of the modem, giving my computer a "real" IP address and allowed my signal to be routed properly to the game servers.
Recap, enable RG Passthrough, your modem will reboot, and when it comes back up, you may get a message on your computer about a new network being found. Set up the new network on your computer which is very simple, just follow the steps, and hopefully you will now have a much better connection to the game servers and not be getting the packet loss/connection issues any longer.
It absolutely worked perfectly for me, I have been playing for 6 hours straight, and not one single disconnection.
I really hope this helps some people out there that have the same or similar cable modems where they are having disconnection issues with The Secret World, or any other online game for that matter.
Please reply and let me know if this helped you or anyone you know with disconnection issues!