From SE:
-----We are sorry that you are having issues with your connection in Final Fantasy XIV: Online.

First ensure that yuo are using a wired connecting instead of WiFi to connect to the internet. Then please try these steps to see if they would help with your connection problem.

- Flush your DNS cache
- Press Window + R
- Type cmd.exe and hit return
- Type ipconfig /flushdns then hit return

After you have flushed your DNS we would like you to change to use Google's DNS. Connectivity can often be improved by using an alternative DNS server such as the ones provided by Google. Alternate servers can often be faster and more reliable than the ones provided by your ISP. There are directions for this under 'Microsoft Windows' on the following link; https://developers.google.com/speed/...dns/docs/using

We would also suggest that you to try changing the port forwarding for your router. You can find your router type and the follow the directions from the following link to forward your ports; http://portforward.com/english/appli...l_Fantasy_XIV/
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I have tried all of these measures and no change to my 90k issues.