When the temperature drops below 30 degrees F my

Put the down force adjustment back where it was as it affects the safety reversing. If the main light flashes 10 times when you try to close the door it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a bit if necessary. It could be an electronic component that is sensitive to cold and quits when the temperature drops. This is not uncommon.

Buy a better opener