Ever since the 5 minute maintenance, I've been getting constant Error 90000s every 20 minutes or so. I never had this problem before. I have changed absolutely nothing on my end. Something in that maintenance messed things up for me. It's now impossible to use duty finder as DPS as I'll get disconnected before the queue will pop, removing me from the queue.

Wired internet connection.
Always "Connection: Excellent" at character select screen.