Why do I have to replace bearings on a ford freestyle so much?

Just replaced rear bearings on both back tires last yr. Its making the bearing sign noise, why do they go thru so many beaings

This is odd. Have new set fitted by main dealers. They ought to last a long time. Likely incorrectly fitted? Wrongly torqued? Poor make? Wrong set?

Somebody used a hammer to install them.

Is the bearing adjustable with a nut? So yes youve prob overtightened it. Wheelbearings should last for at least 5-10 years