I have a liftmaster garage door opener, about 5 years old. The temperature here, in Georgia, has been below freesinf for the past 3 days, and now the opener doesn't shut. It goes down till it is about a foot off the floor then goes back up, no flashing lights, indicating an obstruction. Door sensors are lit and steady. Can the temperature be affecting something on the opener? Do I need to adjust something? Please advise.