The call we hear most out of Winfield is some version of: the door closes, then comes right back up on its own, or it stutters halfway and reverses for no visible reason. Nine times out of ten that's the photo-eye system - either a sensor knocked out of alignment by a stray box or a bike, or, on the oldest untouched openers from this build era, no auto-reverse sensor installed at all, which means the opener is reading a different fault entirely and just failing safe.
The second most common symptom is a loud bang followed by the door refusing to move - that's a spring, and on a door pushing forty years old, it's not a surprise, it's overdue. If your door does either of these, don't force the manual release and try to run it by hand repeatedly; that just adds wear to a cable that may already be compromised. Shut the opener off at the wall switch and call. We can usually tell over the phone which of these two it is before we're on site.