charmberlain security+Mode.8200 1/2 hrspwr indicator light blinks for no reason. Confirmed that multifunction door control and wireless keyless entry Model 940CB have no stuck buttons. It has happened a few times over the winter and I can't figure out why. I haven't pressed the smart button because I have not set a new or temporary passcode in a year when I installed a new wireless keyless entry. What do you think is going on and how do I eliminate the blinking indicator light.