Hey there SE-ers! A very puzzling thing happened in my culinary explorations this week, and I'm hoping some of you can figure out what the issue is. About a month ago, I bought a Cuisinart 1.5 qt ice cream maker with two freezer bowls. Since then, I've successfully made ice cream and sorbet about a dozen times.

All of a sudden, this week, the freezer bowls will not freeze even though I've left them in the freezer for days. It hasn't gotten dramatically warmer in my apartment in the last week; I've actually cleared things out of the freezer so I know it's not overloaded-- and other things I've put in the freezer have frozen solid in an hour or so; I haven't put the bowls in the dishwasher, just hot tap water; and they're in the back of the freezer.

I have no idea why they all of a sudden won't freeze-- anyone have any insights?