Just want to chime in on this.

I've been having the same issues with intermittent disconnects over the past week to the point where I just can not log in at all since this morning.
It's a continuous steam of POL-0011 and POL-1160 errors, and when I do manage to get through PlayOnline and try to sign into character, it just kicks me out straight after.

My ISP is Ziggo in NL, and when I trace to 202.67.54.52 the connection goes through a number of Vodafone servers (213.51.195.197 / 213.51.158.110 / 213.51.64.186) before connecting to cogentco hubs. After that it just turns sour and the average response time increases up to 326ms. I tried to connect and trace to the Mana datacenter for FFXIV and that's giving me the same problems.

I tried a tracert on yahoo.co.jp and that for me is almost as bad, with times starting around 100ms and then maintaining a 300ms average. Tracing livedoor.com completely times out for me.

This is pretty bad and infuriating ¯\_(ツ)_/¯