Sagging is one of the most common structural defects found in metal gates. Both the swing and slide gates can have this issue. Sagging is usually caused due to: *Small-sized gate operators *Loose, damaged, or weak hardware or hinge welds *Leaning support post *Movement of soil. Most of these issues happen due to faulty installation. That's why you need to go for professional metal gate repair service providers like Brookylnz.