Sometimes I find the Hot Questions widget appears hung, stuck or frozen. The Refresh button indicates that I have tapped on it by turning blue but the question doesn't change. So the widget UI itself is not frozen - but some back-end process is.
Even after I press the Refresh button several times, the question remains unchanged. But if I stare at it long enough it may come out of the frozen state and very quickly run through several questions (as per the number of taps I did on the Refresh button when it was frozen).
This is very annoying and I didn't find any quick fix for it. I hope you can find the actual problem why it appears hung, and fix it. I have a feeling it's because the widget is polling for new questions from the network. Or something else.
In case it maybe device related, I use a Samsung GT-I9305 with stock Android 4.3.