The answer to 'my drip edge is failing' is that the drip edge on your roof is likely coming loose or deteriorating, causing leaks and water damage. Common causes include improper installation, age and weathering, or roof movement and settling. Symptoms include visible gaps, cracks, or corrosion in the drip edge, as well as water stains, rot, or mold on the fascia board or exterior walls below.
Repairing or replacing the drip edge is often a DIY-friendly task, but may require some roofing experience. For minor issues, you can try re-securing the drip edge with roofing nails or screws. More extensive damage may require fully replacing the drip edge, which involves carefully removing the old edge and installing a new one. However, if the underlying roof structure is compromised, it's best to call in a professional roofing contractor to assess and address the full extent of the problem.