Yesterday when I played I was seen by 2 zombies. Wasn't going to be a big problem I thought, but I noticed they would never go away. I just couldn't lose them at any time.
I saw a warehouse building I believe it was, at the back there was a ladder and at the front too. I thought I could lose them by climbing up at the back and go down at the front, since it was a pretty big building.
Very strange, but I kept hearing the zombies like they were right beside me. I noticed that they moved through the building walls following me to the other side of the building.
I was stuck on the roof, I couldn't go anywhere so I disconnected.