The answer to 'why is my asphalt shingles' is that there could be several common causes, such as age, weather damage, improper installation, or lack of maintenance. Symptoms may include curling, cracking, blistering, or loss of granules. Solutions can range from minor repairs to full roof replacement, depending on the severity of the issue.
In general, minor problems like a few damaged shingles can often be DIY-friendly with the right tools and techniques. However, more extensive damage or full roof replacement is best left to professional roofing contractors who have the expertise and equipment to ensure the job is done safely and properly.