The answer to 'ridge vent curling' is that the most common causes are improper installation, exposure to the elements, and age. Symptoms include the vent material becoming warped, cracked, or detached from the roof. Solutions may involve re-securing the vent, replacing damaged sections, or completely replacing the ridge vent if it's beyond repair.
In many cases, minor ridge vent issues can be fixed with a DIY approach, but it's important to take safety precautions when working on the roof. For more extensive damage or if you're unsure of the best repair method, it's recommended to hire a professional roofing contractor to evaluate the problem and provide the proper solution.