ive noticed ppl selling thin sizzix style dies that are cheaper than wooden dies and have recently bought a couple but after about half a dozen cuts the foam goes very flat and the card gets stuck to the metal. ive even had the dies seperate. what am i doing wrong and how can i get my moneys worth of cuts out of them as there are a lot of designs i want but they just not lasting. i use the big shot and have the multi purpose adaptor platform. any advise would be great thanx