The answer to 'vacuum buildup' is that a clogged or dirty vacuum can cause reduced suction and poor cleaning performance. This is typically caused by a buildup of dust, hair, and debris in the vacuum's filters, hose, or brush roll. Symptoms include the vacuum not picking up dirt and debris effectively, the motor running loudly, or the vacuum overheating.
To fix vacuum buildup, you should first check and clean the filters according to the manufacturer's instructions. You may also need to remove and clean the hose and brush roll. If the issue persists after cleaning, you may need to replace worn-out parts like the filters or brush roll. For more complex issues, it's best to call a professional vacuum repair technician to diagnose and fix the problem.