Ball joint fix/solution

I have replaced all 4 of my ball joints within the last 3 months. A month after I replaced both the lower ones my passenger lower ball joint snapped off. So I got I replaced the next day. Now about another month maybe month and half at most later it broke again pretty much exact same way. I am not a mechanic I don't have slightest clue on what is causing this to happen. Was hoping that someone here would have some insight on how to go about finding out what is causing this to keep happening. Thanks