Is the ice maker used regularly?
If ice is not used regularly, it could clump and fuse together. This is considered normal. Gently break the clumps up with a plastic utensil.
Is the temperature set correctly?
If the freezer is not cold enough, it could cause the ice cubes to slowly melt and clump together. The recommended temperature is 0o, but you may need to set the freezer to a lower or higher temperature depending on the surrounding conditions. For directions on how to set or change the temperature for your refrigerator, please see the "Using the Controls" section of the Owner's Manual.