We have the Elation Stage Setter 8 with 8 PAR can lights. We did a show this past weekend and half way through they quit working properly. When pushing the faders up the lights VERY slowly came on, and wouldn't go off right away when pulling the sliders down again. All the pre programmed scene's didnt work any more. The only thing that worked was the bump buttons. Everything woked great till about half way through the concert. Anyone have any idea what the problem may be?