Widespread stability issues in general across North America and elsewhere..it's particularly bad along the US East Coast, where most of us get routed through on the way to Montreal. And it's not just FFXIV--even services like Netflix are feeling the impact. Might have something to do with all the thunderstorms and such in the big storm system moving through today:
(note these images update periodically throughout the day, so the patterns may change later)
http://www.weather.com/maps/current

https://downdetector.com/status/netflix

https://downdetector.com/status/playstation-network

https://downdetector.com/status/xbox-live

https://downdetector.com/status/time-warner-cable

https://downdetector.com/status/comcast-xfinity

https://downdetector.com/status/att

Just saying... you may want to take a moment to see what may be going on along your route to the servers before piling on SE, as it may not be something at their end causing the problems:
Code:
C:\Windows\System32>tracert 199.91.189.30
Tracing route to 199.91.189.30 over a maximum of 30 hops
1 1 ms <1 ms <1 ms LPTSRV [10.10.100.1]
2 364 ms 462 ms 389 ms cpe-075-176-160-001.sc.res.rr.com [75.176.160.1]
3 18 ms 15 ms 18 ms cpe-024-031-198-009.sc.res.rr.com [24.31.198.9]
4 19 ms 18 ms 19 ms 24.31.196.212
5 24 ms 25 ms 22 ms be33.chrcnctr01r.southeast.rr.com [24.93.64.182]
6 30 ms 30 ms 32 ms bu-ether14.atlngamq46w-bcr00.tbone.rr.com [66.109.6.82]
7 24 ms 27 ms 27 ms 107.14.19.99
8 27 ms 26 ms 26 ms te0-0-0-10.ccr21.atl02.atlas.cogentco.com [154.54.12.109]
9 25 ms 26 ms 29 ms be2050.ccr41.atl01.atlas.cogentco.com [154.54.0.165]
10 33 ms 35 ms 36 ms be2168.ccr21.dca01.atlas.cogentco.com [154.54.31.94]
11 41 ms 39 ms 41 ms be2148.ccr41.jfk02.atlas.cogentco.com [154.54.31.118]
12 45 ms 43 ms 43 ms be2106.ccr21.alb02.atlas.cogentco.com [154.54.3.50]
13 47 ms 47 ms 49 ms be2088.ccr21.ymq02.atlas.cogentco.com [154.54.43.17]
14 63 ms 65 ms 63 ms 38.122.42.34
15 51 ms 49 ms 48 ms 192.34.76.10
16 48 ms 50 ms 51 ms 199.91.189.242
17 49 ms 49 ms 50 ms 199.91.189.30
Trace complete.
It's been raining almost continuously in our area for the last 24 hours, which is known to cause issues for us locally. Old wiring and crap... Time Warner is dragging their feet on upgrades--still see RG59 run in some neighborhoods. Notice how bad that hop for that Conway, SC gateway is lagging in response times. That is a stone's throw from a major retail/tourist trap called Waccamaw, which is on the way into Myrtle Beach, SC.
So, on top of issues that can be tied into foul weather, it is also getting hammered simply because it is mid day on Christmas Eve. That is a prime gateway for us, and it is simply grossly overloaded at the moment. It isn't enough to case me to drop out, but it is causing noticeable jitter in the game and video streams. The Roku's are also buffering about every 10 minutes or so.