I purchased a new set of pans that state they are for use on induction cooktops. We tried one and it was working until my husband lifted it off the cooktop and then it shut off. We were not able to get it to go on again. It flashes like the cookware is not the right kind. The set of pans we purchased were Circulon Symmetry. Has anyone else had problems with their pans and is there a certain brand that works the best???