Feed us more facts. Following up on San Rensho's question: when you inspect the flatted tubes, what do you find and where do you find it? That can provide an important clue to what might be going on. Is there a single hole or a "snake bite" (2 holes)? On the inside of the tube or the outisde? At the valve? In the same spot along the circumference of the tube, or different places? Have you checked the inside of the tire for tiny objects that might be causing your problem? What is the recommended air pressure for those tires, and what pressure do you run? And so on....