I've been experience Error 90000 all week now I experience even during non-peak periods...I have no idea what is wrong?

I just want the connection to be stable enough to complete a quest....everything was fine until this week ><; I've spoken to my ISP (Telstra) and there is no issue on their end...they are not throttling my FFXIV connection and I'm still experience this error A LOT ;; Usually within 5 to 10 minutes of play...

Please help!