I am late to the party but it sounds like the rotor is rubbing against the stator. Look for wear marks on both.
Rotor:
Stator:
Or the bearing housing may not be true/out of round and allowing the bearing to move. Look for wear marks there.
Lastly, like Northmount shows, the bearing may have been damaged during assembly. If it was driven on with a hammer, brinelling may have occurred. Installing a bearing takes special tools to prevent this. If the installer used hammer blows on the outer race to push it down the shaft, damage could have occured.