finally i've realized what happened.
if you having building window open and goes afk - it actually doesn't
so open building window - not getting afk - not logging out - die from starvation in two hours (thank for our brilliant devs who made people die from hunger in several hours, even if they just finished eating a bear)
i don't know is it client bug or server. but there is a problem... start building something, distract from the game - you're dead, rip.