Your unit is probably in Shop Mode.
To get it out of Shop Mode, hold down the MENU button for approximately 15 seconds (or until you see the screen briefly blink).
If that doesn't work, try pushing and releasing the volume UP button, and then pressing and holding the MENU button down for 15 seconds.
Keep me posted.
I have this DLP TV from Samsung. When I set picture settings such as contrast, brightness, picture format etc, these settings will sometimes remain until I change channels or input sources and such but sometimes even while viewing with no user input the picture settings that I just set up will revert back to factory default "dynamic". Anyone seeing this trouble? Is it a know issue? How do I fix it? It drives me nuts! Anyone? Thank you.