I have that fault to, temporary fix to close mirror in my case (not have auto mirrors close) is turn headlights on an after several seconds push button that closes mirrors
When headlights on dc-dc charging 12v battery and giving 14,5-14,7v (that simple giving more power to mirror motor), this charge not constant and many times I seen that voltage of 12v battery is only 12,6v while car in ready mode.