The answer to 'architectural shingles leaking' is that there are several common causes, including improper installation, age and weathering, and damage from storms or debris. Symptoms may include visible leaks, water stains on ceilings or walls, and mold or mildew growth. Solutions can range from minor repairs to full roof replacement, depending on the extent of the issue.
For minor leaks or damage, some homeowners may be able to make DIY repairs, such as replacing individual shingles or sealing cracks. 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.