Adjust the head to remove all play or looseness. See Page 18 in the Owner's Manual. Replace the blade.
Dull blades cause hooking.
Replace after 2 or 3 mats or 10 to 15 cuts. You may notice additional drag as a blade begins to get dull. See Page 9 Adjust the blade to just cut through the mat and about half way through the slip sheet. Hooking can be caused by the blade projecting too far out of the magazine. See Page 9 Be sure to use a slip sheet under the mat. and press down on the clamp handle so the mat does not slip or move.