How long ago did you purchase the mat. Are you using it on a flat non-giving surface? I had mine on a folding table that would give in the middle. Actually the whole table would give a little. Got a board (plywood) then it worked fine. I can use it on my kitchen table also and ihave a different cutting surface now. It's piece of plywood on top of 2 base cupboard. If you still have trouble call Fiskars and tell them about it. Maybe you also have a bad blade. It happens. I opened a pack of new blades and they were bad. Called Olfa sent the blades back and they replaced all and sent me an extra blade.