Corner drop binds door
On a single-cable door that's one corner dropping while the other side stays level, which binds the door in the track and can bend it if you keep running the opener. On a dual-cable door, common on the heavier insulated panels we see more of in West Pasco, you might not notice the fray until the second cable goes too, because the first failure doesn't drop the door - it just shifts load onto the remaining cable, which then wears faster.
