A problem with the Panasonic models, which this one will also have, is the belt is a dirty belt system. Whatever you pick up can go to the belt and damage it. If you pick up too much grit at once, it will cover the belt and then the grit will make the belt slip on the motor shaft and it will melt a hole through the belt. I ruined my Panasonic's belt picking up too much dog kibble at once and all the pulverized food got to the belt and then it smelled like tires burning then the brushroll stopped. It's probably the belt has gotten dirty or it's stretched out and too loose.