Strut mount problem
 

Hey everyone, my mom has a 98 Malibu that has a problem with the strut assamebly. For some odd reason, the left rear driver side keeps busting the strut upper mounts. It has been changed a total of 3 times to no avail, struts have also been changed as well. The car is currently running KYB's. Does anyone else have this problem and if so what was done to correct this?? This is starting to become a big hassle,, please help.