Doing random under-50 BG's on my baby necro tonight, and twice it's happened that as the round was getting close to ending, my screen froze, and I was transported back to the login screen. It took a few tries each time, but it let me log back in. When I got back in, I was out of the BG, and back in the overland area I had been in previously, except with a deserter timer keeping me from queueing up for a new BG. So twice, in one night, I simply got frozen out of the game and kicked, depriving me of my rewards (we were in first each time this happened ), and then penalized for that by not being able to q for battlegrounds when I got back in for 15 minutes, giving me no chance at the rewards I just lost out on.