Hi, Shirley! The two most common reasons for this are a dry surface on your dough (generally due to lack of a plastic covering over your loaf as it rises) or a loaf that's simply been allowed to rise too long on its second rise. If you're quite sure that neither of these was your issue, do feel free to reach out to our Baker's Hotline, and we'd be happy to help you troubleshoot in more detail. Happy baking! 

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