Tiny piece of glass was causing my flat problems.

I got another flat, but this time I found a tiny piece of glass embedded in my tire. It was smaller than the head of a pin.  I had at least 6 flats from it. I felt the inside of my tire each time, but I could not feel or see it. I got lucky because the hole was lined up with the valve stem so I looked at the tire there. It was so small I could barely see it. I hope my flat tire problems are over now.