As far as stories disppearing altogether, I think I know the answer to that 1.
It happened to me recently & it seems to be cos you haven't added any credits for a long while, even tho you may still hv some in the kitty..
Exactly how long tt while is I don-t know.
But I added a new one - & voila, the story reappeared the next day.
Zuckerberg Shmuckerberg, Starbucks Sucks