I have a problem with my Hitachi 43UWX10B. The set was ISF calibrated a few months back and the picture was perfect until I turned it on this morning. The picture is now too dark, very soft, and my grays have a noticeable blue tint. None of the user controls has been changed. Any thoughts on what would cause something like this to happen literally overnight? This is going to hurt if something is seriously wrong with the set and I have to have a repair. There goes my 4 month old ISF calibration out the window.