I have a Crafstman 1/2 HP garage door opener in my garage that is a little over 5 years old. The problem I have been having during the past couple winters is that when the temperature gets frigid cold (usually anything below 30 degrees F) my garage door only opens about 10 inches and then stops. I usually have to open and close the garage door 5-10 times before the door opens. Sometimes it takes many more tries. The problem is not the door itself, it opens just fine manually (I've had to do it on occasion to get to work on time). I have heard of using some sort of lubricant that withstand freezing temperatures as well as tightening the main screw that cranks the chain. Again, this problem ONLY occurs when it's well below freezing. Please help! Thanks in advance.