The answer to 'flat roof missing shingles' is that missing shingles on a flat roof are a common problem that can be caused by age, weather, or improper installation. Symptoms include visible bare spots, leaks, and water damage. The solution is to inspect the roof, replace any missing or damaged shingles, and consider a complete roof replacement if the damage is extensive.
For minor issues, homeowners may be able to DIY the repairs by carefully removing and replacing the missing shingles. However, for larger 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.