Ike the Dewalt has a design flaw in my opinion with the motor. The carbon brushes are soft carbon and when the motor runs it of course makes carbon dust out of the brushes. The motor has no where for the carbon dust to go and the carbon dust is conductive, this can short out your motor over time. If they would put a little harder carbon brush in the motor this would not happen as often. Did you use the GRP ( Guaranteed Repair Price ) program that Dewalt has?
DW