I have the same problem on my '13 Diamondback. I called M&R Tech help and they said it was faulty clamps. It was only an issue on one clamp but they told me i had to replace both at the same time. I just got the replacements. How do i remove the clamps? It looks like a hex wrench from underneath. 224 mentions the notches and you should turn your squeegee around so the clamp is in full contact. I checked my clamps and they are 60% on full contact, 40% off no matter how you install the squeegee. Many other clamps have the same problem but i usually flip the toggle a couple of times and the air leak will go away. Does this help or make sense.
Peter