Sears garage door opener
I installed a 1/2 hp sears garage door opener 2 years ago and it worked fine until now. After my garage door opens it starts to slip down slowly after opening to it maximum.
After it travels a couple of feet it backs up again . It does this sometimes a couple of times before ir remains open. The colder it is the more times it reverses until it stays open. I have tried adjusting all of the controls but to no avail please advise me if anything can be done to resolve this thanks
Regards John Corrigan