The new version of the bug: when I walk sometimes suggest that to sink in water for a few seconds.
thus to this bug happens when I walk on the ground floor,
it's new bug https://postimg.org/image/s9jeoia6x/
when I hold spear and attack shark, after I attack sharp spear in normal
I can no longer attack with this spear, then I have to restart the game. but the bug reappears