Lower control arm replaced three times within 7 months on 1991 Toyota Camry

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I cuurently have my toyota in the shop again to ahve the right lower control arm replaced. This is the third time I have to replce it in the period of seven months.
I spent a lot of time in the highway and realy did not want any know of these to break while in the hwy. Does anyone of possible cause to this issue? It is a used car with 205 thousand miles but still runs good.
(1) Answer
What exactly is happening to the lower control arm? How is it being damaged. What symptom does the car exhibit when the control arm fails? Something does not seem right about this situation.

Good Luck!