If it's the same bearing, the most common cause of repeat failure is improper installation procedures. There must never be any vehicle weight allowed to be on the bearing unless the axle nut it torqued to specs. That torque spec is critical too. A click-type torque wrench must be used. Most bearings call for around 180 foot pounds but some are as high as 240 foot pounds. The wrong torque will lead to them becoming noisy.