Hi again

I have a 1995 lwb and a new problem started this week with the windshield wipers. when I turn them on to the intermittent setting they go up the windshield and then stop and then occasionally move a few inches. When I turn them on to the regular settings they work fine – except when I turn them off they stay wherever they were when I turned them off, so often it is in the middle of the windshield. I can turn them on and off again to get them close to the bottom, but this is a big distraction when I am driving. Plus its annoying. J

Any clues? Thanks