Same thing happened to me as well. I had mosin, m4a1 with all upgrades and a LOT of mags, all decked out with spray paint. One zombie came out of nowhere and hit me. I was hydrated, energized and healthy - all green bars were there. I had a ballistic helmet on and I still died from one hit. I did not go unconscious or anything just instant you are dead. I think I will wait till this gets fixed I spent the entire day getting gear.