Stressed Blaze climber

Not a pretty picture. I would really like to grow climbing roses on this trellis. The first year we dug these approx. 2x2 ft holes (about 3 ft deep) in the brick patio, I had Climbing Eden and Sally Holmes here and they were stunning for about 3 years. Then they lost all their leaves and died. I put in an Improved Blaze. This is its second year and it doesn't look good. I'd love any advice you have. Does it need more consistant watering, soil improvement, or are the holes just too small? Is the winter damaging it too much or is it the summer sun? It gets full sun. It looked OK in the spring. The summer sun seems the problem. No bugs, no aphids, no mildew, just drops the leaves.