I have owned a Princeton AF3.OHD Direct View HDTV for about two years and have continued to experience an image shifting problem with it. What happens is that after about 2 hours of viewing the image gradually shifts until the right notch is no longer visible and there is about a quarter inch or more gap between the edge of the screen and the image. While still under warranty Princeton replaced the main board with a new board except for the E-Prom which had the ISF calibration settings. This seemed to fix the problem for a time, but I have again started experiencing the same problem. I can hide this by using horizontal sizing, but by doing this I am losing well over 5 percent overscan as evidenced by the overscan test on the Avia calibration disc. As many of these sets as Princeton has sold I'm led to believe that I am probably not the only one having this problem. Any help provided by you knowledgeable home theater enthusiasts would be greatly appreciated.