I have just bought a 36ZP18 and am disappointed with picture geometry in 4:3 and 12:9 modes. The vertical black bar down the left side of the screen is far from straight and moves around by an inch or so in parts depending on picture content. Comet were brilliant and swapped it for another set, but that was worse, with picture content "bleeding over" into the black bar. The picture itself is beautiful but the "wavy" black bar is very distracting. Any ideas please?