3ds Max :: Rendering In Active Time Segment

I am really messing my model,.. am using 3ds max 2010,. my problem is when i render my animation in active time segment my first frame seems ok,. but as its goes on the lights looks fading or turning it off as it goes by i already check the "compute advance lighting when required" and nothings change,.. let me attach some pics.

the first pics is frame 0000, the second pics is 39th frame,.. if you take a look on white materials they turned grey,.. and in frame 200 the lights are really out i cant show them any more cause i deleted them and when i render in range (i.e.) i start in 40th frame the lights or materials came perfect but again if goes by the result fading let me attach the 40th frame using "range".