Today I had a strange thing happen on my sliding compound miter saw. It was set up on a table on my back deck. It had been out there for a few hours. All of the boards I cut earlier today were fine. However, just before I brought the saw in, I cut a 10" shelving board. The Freud Diablo blade had trouble going through the 3/4" board. (The wood had been inside the house for days.) The blade burned the wood. Thinking the problem was sawdust on the table causing the board to flex and pinch the blade, I cleaned the deck and did another cut. The same thing happened. What's going on here? The saw acted like the blade was dull, but not only is it new, but it worked perfectly all day.