I am having the same problem with my System 11C Rollergames. When three of the flashers fire, each one of them triggers a separate coil at the same time. Flasher #5 fires VUK, Flasher #6 fires Drop Targets, and Flasher #7 fires Cabinet Knocker. The coils work separately when they're supposed to and do not fire the associated flashers. I have 8 month old main power board, aux power board and interconnect board. When I disconnect the flashers from the interconnect board, the problem still happens. Any thoughts? Did you fix Big Guns? Thanks!