I am connected to my router via cable, I have not had any network changes when I went down. My Firewall is allowing FFXIV. I have also turned the Windows defender firewall and router firewall off to see if it makes a difference, yet it doesn't. I was in-game too when the sudden disconnection happened as well.

I'm also seeing some other Australians having difficulty connecting to NA servers to with recent posts. So I don't think its just me