Driving my 82 BJ42 to work today it started to rain so I tried to turn on my wipers and they did come on, however got stuck half way, then started again and got stuck, this happened a few times. I turned them off, tried to turn them on and nothing, no movement. Tried turning them off and on a few more times and again with the stopping and starting. The blades are new and I have never had issues before...and it was raining hard enough that they wouldn't stick to the window. Any idea what this problem is?