Samsung Flat Screen

[Console User]

We bought a Samsung 40 Inch Flatscreen about two years ago or so. It's LED so the colors are really really bright. What is the average lifespan of this particular type of TV? Has there been any problems with the Samsung LED TV's?? The only thing I notice on ours is that sometimes the picture is really bright and all the sudden it adjusts and becomes real dark. Also, sometimes when you look real close the brightness & darkness flucuate is this normal??