The answer to 'my architectural shingles is failing' is that there are several common causes, including improper installation, normal wear and tear, severe weather, and defective shingles. Symptoms may include curling, cracking, blistering, or missing shingles. Solutions can range from simple repairs to a 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 DIY the repairs. However, for more significant problems or if you're unsure of the cause, it's best to call in a professional roofing contractor to inspect the roof and provide the appropriate solution.