hey guys was wondering when starting as a new player how come I have literally 20 zombies chasing me.. even to the point where I lose them from hiding in trees and buildings but all of a sudden a f**kn zombie will walk through a wall and kill me?? as a new player do zombies smell u easier or something as its soo frustrating they spot me in like 2 seconds even when I try prone crawl around them from a distance.... please let me know what im doing wronge