So I went to turn my wipers on intermittent slow and they would only work as if I had put them on hi. It doesnt matter where I turn the selector to in the intermittent selection it only works as if I had put them on hi. I can run low and they work as should and same with high. I had to replace the wiper module last year when I bought the jeep because the old one was full of sand. What could be causing this issue?