My RPTV (Toshiba 57HDX82) has been exhibiting a slight green flicker over the past little while. It appears that the green lamp briefly becomes a little brighter than the blue and red lamps; like a faint green filter placed over the picture. This is random and generally lasts for a second or two. On more infrequent occasions, it'll do this for up to 3 or 4 seconds. I can't see this being the fault of any particular source device, or input. It does this while watching satellite (on S-Video), DVD (on component 1) and Xbox (on component 2). Could my green CRT, or some circuitry be faulty? My TV has not been professionally calibrated, but I can't see that helping... Thanks!