#1 - Sept. 27, 2013, 8 a.m.
Blizzard Post
We’re in the process of applying a hotfix that will restrict a player’s ability to queue for a Rated Battleground if they've left one prematurely, until the previous Battleground is completed. Once the hotfix is active, should you find yourself unable to queue for a Rated Battleground immediately after leaving one in progress, you’ll simply need to wait until it has finished and will then be able to queue once again.