i noticed recently that if you que up for a random, dont like it and leave the que, you can still que up for random battleground, and it removed the dungeon deserter debuff. then if you leave the bg, you can que up for random dungeon again. The game only allows you one debuff and they dont effect each other. Might be a bug for now, but it's gotten me around alot of instances i didn't want to do lately.