Test works only once

A test crashed when it didnt find the image to click. But the image it was supposed to click was right there! I checked the matching preview and it located the image on screen in red with no other possible matchings (.92 similarity)
I ran the test again and it worked. Really strange. This might not seem as a big deal but it is for regression testing....which I am looking to do.
Anyone has a idea? or similar experiences? I think it has happened several times before but im not sure.