commercial ice cream maker

Why homemade ice cream harden after freezing?

I have a Cuisinart ice cream maker. Immediately After that the ice is made, is soft, but after freezing it becomes hard and granular. Does the machine is inherently flawed or ingredients are responsible business decisions to understand?

Let mixture stand in refrigerator overnight and then is rotation. It seems to have ice crystals is too big. you must beat at first and then move up a gear to beat in the air.

1990 Barbie Ice Cream Maker Commercial