I bought an Astar 32" TV from PC Connection. It was $680 with a $100 rebate. Great deal. I noticed some serious vertical banding on the set and requested an exchange. PC Connection was very cool about it and will pay shipping back AND overnight me a new TV. However, I did notice that it only happens after the TV has been on for some time. When it starts cold it does not have the vertical banding. What is up with that? Is that a design problem with the TV in general or a defect of this particular unit? Any advice would be appreciated.