I myself have had issues with large amounts of zombies flooding an area after making noises. The first ten or so games I played after the update left me dead within a week of game time. This last game it was turning out to be the same results but I went all psycho on the mass of zombies where I could and just wittled them down by about a hundred. Alot of work trying to seperate small groups to kill but after I did this my area has been stragly quiet. I play a deaf guy so I am assuming they heard a sound since I seen them all wonder off into another direction. I imagine there is a large hoard waiting for me somewhere deeper into the town. In the mean time I now have two bases stocked and prepared. In the new game trying to get petrol from the station before the electricity shuts down is pretty much gone for me. Hope they get it so that generators run at the station instead of using the mod.