Today it was worse, when I went out for Lunch. I drove the whole way and back for my Lunch, trying to identify the source. It looks like its coming right near the windshield on the driver side (looks like a small penny or a pin is hitting the windshield). As edgy pointed out, it does not happen many times, but this week its been worse. One thing which changed is that the temperatures here in Michigan dropped down to 50's and 60's this week.
I have escalated this to Ford Customer Service and they have replied back to me saying that someone will contact me within 2 business days. Lets see what the Customer service has to say. In the meantime, I will try to find a new dealer and show him the problem. I hope I get lucky this time