The answer to 'my asphalt shingles is failing' is that there are several common causes, including age, weather damage, improper installation, and lack of maintenance. Symptoms may include curling, cracking, blistering, or loss of granules. Solutions can range from spot repairs to full roof replacement, depending on the extent of the damage.
If the issues are minor, such as a few damaged shingles, you may be able to handle the repairs yourself. However, for more significant problems or if you're unsure of the cause, it's best to call a professional roofing contractor to assess the situation and provide the appropriate solution.