I cannot speak to NPCs or perform any actions without a disconnect, so it may be an issue with me sending information to the server. So, I re-tried updating the firmware and turned off the router for 30mins. I allowed the TCP ports for FFXIV.

I logged in five minutes ago and upon talking to an NPC, I disconnected. That is now everything I can do, short of buying a new router, which is relatively new and functioning flawlessly for everything else besides FFXIV. I'm afraid to buy a new router, because it doesn't seem to be an issue and I don't want to spend any more money on this game, of which I have already paid the initial cost and six months (stupid me).

So, I'm at a loss. I sent a second request for help to Square on Friday last week, still waiting on a response, probably today or tomorrow. I'll update when I get the new response. I hope to actually solve this, whatever the problem is, so I can help others and play this game that I like a whole lot.