The call we hear most from this stretch of houses is a door that reverses partway up, or binds and groans before it clears the opening. On a house from the early '70s, that's usually one of two things: a track that's gone slightly out of parallel after decades of settling, or a spring - extension or torsion - that's lost enough tension that the opener is straining to do a job the spring used to do on its own.
Neither of those is an emergency in the sense of danger, but neither gets better by waiting. A door straining against a weak spring puts extra load on the opener's gear and motor, and that's a more expensive part to replace than a spring.
If the door drops suddenly instead of binding, stop using it and don't try to force it. That's almost always a spring that's fully let go, and an extension-spring door with cables missing their safety loop is a real hazard, not a maintenance delay.