I'm very sorry to hear that has happened, and I apologize for any inconvenience this may have caused you. In order for me to help you most accurately, please provide the complete model code for this device.
I have a Samsung Plasma 55" 2 months new and not all the time but sometimes the picture is bright and sound loud then the TV goes black for a second and the picture comes back dull and sound quieter. It will flick between these two until you turn the TV off after awhile. Can anyone please help? Is this an automatic setting I need to turn off as it's going mad?