[gchas]

[?]My garage door opener (Liftmaster-Professional Line, Formual I) has worked fine for 4-5 years. Suddenly this year it will go down in the cool morning or evening hours, but when the ambient air temp in the garage gets into the 80s-90s, it refuses to go down all the way unles we stand with our finger on the button mounted on the wall. Otherwise, it stops, the lights flash and it comes back up. The man who installed the door, first told me to adjust the downward force on the door. I cranked it up to maximum, but it did not help. Then he says this is a camera problem related to the position of the sun. I think this is bunk, otherwise how does one explain that it has worked fine for several years regardless of sun position or garage temperature. Anybody have an idea as to what is causing this problem?