I just noticed several times in multiplayer losing some HPs for no reason.
I played 404Wasteland some minutes ago when I tried to buy some stuff at the gun store. The gun store was in a completely destroyed building with some burnt out vehicles around.
When I first entered the ruins I noticed that my HP suddenly dropped from 100 to 95 HP. I was alone there... no enemies, no suspicious sounds, no other action. I also did not fall or had other natural influences when entering the ruins.
After that I began to run around searching for more money. 5 minutes later, when I came back I used the gun store again. Suddenly my 95 HP dropped instantly to 0 and I died.
Being pissed off I quit the game and registered here ;)