I'm having this problem in Chicago on Cactuar. My friend who in the same city with the same ISP (RCN) encounters the issue as well. Curiously, we lag out and get the 90k disconnect error at the exact same time, despite living many miles from each other. A friend out in the suburbs using a different ISP (Comcast), hasn't been experiencing intermittent lag like us, but did get a 90k disconnect error while entering an instance yesterday.

During a disconnect or period of lag, my persistent ping to google.com doesn't drop any packets, but I'll lose at least 3 in a row on my ping to 199.91.189.31 (the IP ffxiv.exe was connected to). Any information would be greatly appreciated. Thank you.