Failed to connect to the instance

Hello everyone! As of the last couple days, the game has been almost unplayable for me. Every time I try to change maps, (via waypoint, portal, or walking to a different map) The game kicks me back to the startup screen, and has the text "Disonnected, Failed to connect to instance."

I've tried using different characters, new instances, joining other players, and changing the gateway, all to no avail. I'm playing on Windows 10, 64 GB RAM, through Steam, with plenty of excess storage space.


Is there any advice anyone can give me? Thanks so much!