Suggestion.......when you take the motor apart to change the brushes......look very carefully at the "flexable" wire that attatches to the brush. Look for any slight color change. A color [white ?] change is an indication of a "bad" wire.
I had a guy at a motor shop show me this and I did not think that could be the problem, the wires looked good to me.....but new brushes got it working again.
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