Wintergrasp Queue - "You have exited the battle for Wintergrasp"

Every once in a while, after being in the queue for Wintergrasp, I get this error message when the battle begins - "You have exited the battle for Wintergrasp", and it doesn't teleport me in, and then when I click on "Okay", the error just keeps repeatedly coming back. Keeps repeating until the battle is over (15 minutes later). What causes this? A few people said to fly into WG while the battle is occuring to get rid of the error, but as soon as I enter the zone, it ports me out.