Interesting. I am getting the same.
I have discovered that when I pull on the wiper switch about the same as if I were Flashing my Highbeams with the turn signal switch, I get the intermittent wipers. Only while holding it.
I can hear a relay under the dash click on.
When I do this, the wipers start for one swipe, just as they should. If I let go and pull again, I get another fresh start. Each time, I hear the relay click.
If I hold the control arm, the wipers will again do one swipe and that relay clicks on it's own.
So I'm thinking it is in the switch. Anyone know the price and ease of repair of this?