At a certain point while playing, I begin to hear zombie noises, people eating and/or someone drinking a can of soda. I check my surroundings and there is nothing. No zombies or people in my area as I play by myself. It's mostly the zombies yelling that I hear. Most of the time the noise cuts off half way throughout it. I try to ignore it, but I constantly have to check my surroundings to make sure it isn't real.