The answer to 'soffit sagging' is that common causes include moisture damage, poor installation, or structural issues. Symptoms include a sagging, drooping, or uneven soffit panel. Solutions may involve repairing or replacing the soffit, reinforcing the framing, or addressing any underlying problems.
For minor sagging, a DIY homeowner may be able to reattach the soffit panel or reinforce the framing. However, for more significant damage or structural issues, it's best to call a professional roofing contractor to properly assess and resolve the problem.