I have encountered zombies on many occasions that simply stand motionless and take no notice even when I sprint by them or approach them.
Some respond, when you walk up to them, but it seems like a delayed reaction.
The majority simply stand still like docile sheep as I walk right up to them and axe them.
Having the same issue. They just stand there no response. Can just walk straight up to them and hit them with an axe
Was going to suicide, walked up to zombies.. and they went full retard.. I could punch them to death without getting attacked.
Game is great, but this zombie issue should be priority number one, if it isn't already.