I have had some luck by connecting through a VPN first and then getting on. The stutter did not happen has frequently (easily playable) but the system still kicks me out with a Connection Lost to Server 90000 error. Test onn both my NA Ultros Server Character & JP Typhon Character. I honestly don't know if the VPN helped or if it was just dumb luck, but just adding one more nugget to this post.

Additional I called Time Warner Cable - Central Texas - and they are not seeing any connections issues at all and I can confirm my internet is running smoothly wit the exception of FFXIV.