Windshield problems of the 1999 Toyota Sienna

I noticed distortion when looking through the windshield. Delray Toyota replaced the glass twice. The distortion is still there, but you see it in different areas of each new windshield. The dealer thinks I might get a good piece of "after market" glass since each of the windshields supplied by Toyota has this problem. The windshield looks like it was moved before it cured properly. This gives a "melted" appearance to the glass. Some people mention the reflection from the dashboard causing a distortion problem, but that is easily noticable and not what I am describing here.

While driving at 35 mph driver's side back window shattered without warning. Please provide any further information.

Reflection of the dashboard in the windshield creates a distortion which impairs visibility, and could result in a collision.