Last year, and now this year again, I've bought hachiya persimmons that were fairly hard in the store and left them on the kitchen countertop, hoping for them to eventually soften. After a couple of weeks or so, I notice that instead of softening, several of them "dry out"...the skin becomes hard and thick and they seem to lose their moisture. Of course, my apartment is very dry being winter and with the heat on all the time, but is that "drying out" expected? If not, what am I doing wrong? I end up throwing the dried ones.