You should check you manual for directions as to how to take the machine apart to clean it because it needs regular cleaning. Since you have not cleaned it in a while, the beans are probably getting super hot and burning inside the grinder because of friction. Also, this particular machine operates best with a drier (less oily)coffee bean... think Italian expresso beans. These drier beans should work better with this machine.
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You should check you manual for directions as to how to take the machine apart to clean it because it needs regular cleaning. Since you have not cleaned it in a while, the beans are probably getting super hot and burning inside the grinder because of friction. Also, this particular machine operates best with a drier (less oily)coffee bean... think Italian expresso beans. These drier beans should work better with this machine.