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If the wipers are stopping on 2 or 3, I suspect your motor.

BUT there is a relay in the system... and the wiper system is controlled by the front left SAM. A bit more troubleshooting is in order, I would think.

Also, I would try greasing the transmission, just to keep it in good condition. Looks like a bit of a chore to get it out, but not awful.

You may find a read through this to be helpful.
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