Kicked out of map (logout), cant enter map again

Hi,

I was just doing a map, when I suddenly got logged out, to the log-in screen. I re-entered the game, the portals were still there, but I could not enter the map again, due to 'unable to join instance, disconnected from server'. This was my first map, I never before got logged out just like that (stable connection). Is this a known bug?