WHY DOES MY DRIVERSIDE CV JOINTS KEEP BREAKING?

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I HAVE REPLACED THE CV JOINTS TWICE SO FAR AND NOW IT NEEDS TO BE REPLACED AGAIN. WHAT IS CAUSING THIS TO HAPPEN? AFTER IT IS FIXED I DRIVE OFF BUT WHEN I GET TO A STOP SIGN AND TRY TO TURN THE CV JOINTS JUST GO AGAIN. I HAVE HAD THEM REPLACED TWO TIMES WITHIN 3 DAYS AND NOW I NEED THEM REPLACED AGAIN. OBVIOUSLY IT IS SOMETHING ELSE THAT IS CAUSING THIS. PLEASE HELP...