2015 scion tC sunroof button only works sometimes, lets fix it!

A bad solder joint was causing the sunroof to only work intermittently. heating up the joint and a little fresh solder and it works like new again. I tried and tried to capture it not working on camera, but the little bit I did get was all I could get. Its like when you swear somethings broken but when you try to show someone it works perfectly every time....