Random Death

Every time I load my survival world I Have a big chance to randomly die from a fall damage even though I would leave my character inside the house or in some safe location. I lost my items few times this way and it's really annoying, because I can't do anything about it. My game loads and then I am dead. And I don't know even were my items are because coordinates would not show, and the location of death is also different from my bed spawn.