Bought the Dewalt DWS780 miter saw a couple of weeks ago. Was really enjoying it until a couple of days ago. Was cutting a piece of pine 5 inch trim, on the saw in a north south orientation, up against the fence. Had it mitered 45 degrees to my left. Half way thru the cut, there was a huge noise and the saw came to a dead halt. The trim in my hand exploded. My hand was bleeding badly, pointer finger mangled up. The saw blade was warped and had cut its way into the cast housing that wraps around the top of the blade. No idea what I did wrong. Any ideas?