Various NTT nodes along routes to some world servers have been unstable for two weeks meow.

NTT node on hop 3 exiting the Comcast ibone is also timing out connections into the instance server for Primal datacenter and likely other NA datacenters as well. As you are on Mateus the likely cause is jump in traffic from event causing unstable nodes to become even more unstable. No moderator will mention this. Perhaps they are informed not to or simply lack understanding of core problem.

If are using the VPN (you should for ffxiv unless close to CA) avoid routes through Ashburn ohhh and also any routes through Canada. LA appears most stable currently with only minor latency increases. Uncertain which VPN you do use but if do not know how to change routes just select different location for VPN of choice before launching FF14.

Many threads exist for this issue and tis not difficult to use traffic analysis tools to deduce problem. Simplest method to check is find server ip > open command prompt > enter tracert (server ip) then hit enter. Should see massive spikes upon entering NTT network.