Breach Fortresses in Atlas Maps Causing Major FPS Following Disconnect from Realm

At first I thought I was going mad honestly, but twice now in fortresses I have lost connection after a major FPS drop. Latency skyrockets pre Breach Fortresses climbs to max and then Disconnects me from the Auckland Realm.

This doesn't happen in any other content and I am mistified what information I can provide. As this isn't a crash to desktop and I can restart the game as normal and try again. Just everytime I have tried a fortress, I have been kicked to the menu shortly after starting it.

I wonder if this has connections to encounters off screen or instansbility post league launch.

Let me know if there is anyway I can provide more information.