I have a 14" Dewalt chop saw that is less than a year old. It cuts great and I have had no problems with it except when cutting flat metals. I cant tell it is heating up the metal trying to cut into it so is this haulting the cut? After a while it will just spin in the groove with almost no sparks flyin hence no/very little cutting. But once it breaks through the metals is starts cutting good again. Is this a heat issue?