Switch problems are common, but it could also be the motor. Then again, the
window and or mechanism could be binding. First thing I would do is
lubricate everything, then I would think about replacing the switch.
It could also be a wire that has worn bare where the wiring harness enters
the door...it's possible that the bare wire only touches metal to short out
10% of the time (it's happened to me with two different vehicles).
Most Issues like that I see are in the wiring going from the body in to
the door. Some times a switch. The switches are the esier part to test,
the wires can be a pain. Get a good test light, check for ground on the
test lamp using the fuse block. Get a wiring diagram for your year and
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