I have bought a TDP MT500 about 5 yrs ago but use it very little (400 to 500 hours at the most so far). At first it was fanatastic, but now the image is very dark (lacks a lot of brightness), very poor in contrast and very poor in colours. It's as if there is a grey veil in front of the lamp. Of course that is with maximum brightness / contrasr & colours set in the menu. Please help ! Kind regards, D.Knowland