I am printing Silver Medal directly to yellow vinyl and am having a problem with the foil sticking. when i open the lid to the fx the heating strip has a bunch of the foil built up across it. dose this mean the foil is no good? i have tried printing 300x300, 600x300, and 600x300 with the foil turned on hot and all three times it has the same results. The foil was purchased less than 6 months ago from my supplier, any ideas?