If you are processing a mixture that is keto (no sugar, but has faux sugars), you have to add a little vodka to keep it from getting icy.  Also, you may need to stop it before it gets to the end of the ice cream cycle.  The first time we made ours, it was very thick and icy on the sides and was almost impossible to get off.  Your tendency is to use a regular ice cream spade to scrape it off, but instructions tell you not to use sharp implements.  All being said, it does process quickly.