I have a 12″ Dewalt miter saw that might be 5yrs old. A few weeks ago we noticed that when you hit the switch there was a significant increase in torque (I’m not sure that’s the right word to describe it, but it kinda came on with a jolt). Now, it’s flipping breakers (I tried 3 breakers. . . . flipped them all). I checked the cord and there are no burn marks or bad insulation. Anyone have any ideas about what else to check? Thanks