Past few months DDoS attacks have been rotating ISP providers. It happens to other games not just FFXIV. However, If you are having D/C issues it could just be your ISP as well. Example: Mine finally updated my speed, and I kept getting disconnects from my internet entirely for a couple weeks. It has now since stabilized.

In regards to your comment about last night, everyone was hit because the ISP that leads to the servers was hit and hit hard throughout the day with a DDoS.

The game is far from unplayable. But these attacks are causing problems not just here, but everywhere.