DC when entering map

I was playing a toxic sewer map and running a blight when I suddenly was sent to the login screen. I log back in, get to my hideout and when I try to enter the map it sends me right back to the login screen...and uses the portal. I tried going into other sections of the game and can do so without issue. At this point I have lost the map but I would like to know what I can do in the future when encountering this problem.