I just had an error, wherein I timed out, It told me, $ERROR_TIMEOUT. This was after trying to drop out to character select and everything went quiet. After such an error, it didn’t even drop me back to the title to try and log in again, it just let me run around the area I was in like an abandoned theme park.
The game became considerably slower after completing the first objective for the first Purifier in 2F. I received no dialogue box indicating quest completion/direction, just the marker popped up. Heading there is when I disconnected.