My guild and I have encountered an issue where the game will just close on us when trying to open the map or hitting the quick travel button. First time was a few days ago on Yavin 4, everybody in our Ops group got booted when opening the map to quick travel. Today the same issue occurred multiples times on Nar Shaddaa and Republic Fleet and continued even when people switched toons.
Edit: Read some other forum posts, might be related to if your account ran Tyth that day(our guild ran Tyth both times this has happened so far).