The answer to 'architectural shingles leaking' is that the most common causes are improper installation, age/wear, and weather damage. Symptoms include visible leaks, staining on the ceiling, and water damage. Solutions may include repairing or replacing damaged shingles, properly sealing flashing and vents, and addressing any underlying issues.
For minor leaks or isolated damage, homeowners may be able to perform DIY repairs. However, for widespread issues or complex problems, it's best to call in a professional roofing contractor. They can properly diagnose the problem, provide a long-term solution, and ensure the roof is watertight and structurally sound.