I'm having a hard time having the garage door automatically close. I press the garage door button once and it opens, but when I press the button once in order for it to close it does not close and the light on the box keeps blinking. If I hold the button down until it shuts it closes it for me, but if I let the button go anytime before the door automatically opens again with the light blinking. It was working fine until this morning, not sure what I did for it to stop working.