Mine does it at night when I'm running nav lights and other accessories off that particular button panel. I don't actually lose the nav lights, outputs stay latched and turning them off and back on clears the condition, lights stop flashing, panel goes dark (selected Decc outputs still latched) then come back on, repeat. So, its quite obviously a temporary condition not a hard failure, in my case. I think it is communication related as Wakejunky was sayin back in the day. I'm going to find the serial communication wires to the decc from that panel and physically separate them, see whats what, it is a three wire serial link like rs232 and there's noise on it. Reprogramming and swapping switch panels won't fix an inherent emi noise issue on the comm buss.