SFZ Problem

For some reason, when I try to insert SFZ in Sonar 8.5, every once in a while, an error occurs when the tracks are being processed, which causes Sonar to crash. Someone told me it's because the sfz.dll file becomes corrupt every now and then. When I reinstall it from the Sonar 8.5 disc, it then works fine again. I'd like to know what causes this to happen, and why does it happen?