alt tab boots me out!?!?

every time i alt tab the game boots me? is this a known problem?when i first started playing this game i never had this problem but after a few patches i could no longer alt tab without being kicked please let me know what i should do to try and fix this problem thanks in advance.

no support or what?

This happened to me a time or two. I just alt-tabbed last time I was playing with no worries?