I have 5 TV's with the cable boxes being run via HDMI from one room in the basement. This is new construction. The TV's blink off when the wall switch for the fans is turned on. The fans are not on the same circuit. Also I have found that when I turn on the light in my master bath it makes the TV blink off in the master bedroom. Then the signal returns after a second. Does anyone know how to stop this from happening?