If it's the same issue as me, it is 100% a FFXIV game/server issue that Square Enix needs to fix. I've included some troubleshooting I've done below to prove this, hoping others can try as well, and give as much data to Square to help troubleshoot.

I have 2 different PC's on the same network. On one PC, I did ALL of the suggestions Square recommended, reinstalled the game, ran network diagnostics, etc. On another PC, none of the changes, and yet I still have the issue on both PC's.

Interestingly and what proves it's FFXIV server/game issue, is that on both PCs, other members of the household have ZERO issues playing FFXIV on their accounts. No disconnects ever. Not once. And when I look at resource monitor server connections for both accounts, they connect to different IPs, even though we are both on Midgardsormr server.

Also, I've run resource monitor on Windows that tracks the TCP connections to FFXIV servers, and when I get disconnected... it records 0 packet loss, and 0 latency issues. My max latency is a cool 65ms, and I'm halfway across the country on a fiber connection. (Windows Key + r, type in 'resmon' then enter to run Resource Monitor, then look under TCP Connections and find ffxiv_dx11.exe to see the server / connection details.

While I'm sure there are people who do have client/ISP issues, I have concrete proof that my issue is a FFXIV server/game issue. But unfortunately I haven't been able to get a support rep's response to dig into it, even though I've reached out via Support Ticket, GM Ticket, and these forums in the last week.

Hopefully my troubleshooting can help you with yours as well, and Square Enix can use to resolve this. Good luck!