Sugar Crystallizing in Caramel Sauce?

Recently, I tried to make caramel sauce, and halfway through the process, the sugar separated from the liquid and began crystallizing before my eyes, despite following the instructions to a T. Does anyone know why? What should I do differently next time? Thanks for your help in advance!
Sugar Crystallizing in Caramel Sauce?
Recently, I tried to make caramel sauce, and halfway through the process, the sugar separated from the liquid and began crystallizing before my eyes, despite following the instructions to a T. Does anyone know why? What should I do differently next time? Thanks for your help in advance!
Kitchen Goddess