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Sounds like you have a cold solder connection somewhere on the main board or power supply. It opens when the junction begins to heat up after prolong use. It probably corrects itself when the unit is cold and the junction re-connects. Your best remedy is to inspect the boards and try to locate the bad solder connection. You can do this, but please be careful when working on live circuits, by using a non-conductive pointed tool and poke at suspected joints on the circuit board - if the unit begins to work again, Bingo, you found the problem.
some devices these days have a built in volume control, try using your remote for which ever dvd player or satalite bix you use, on push the volume up button on it while you have the volume on the tv maxed out so that you will be able to tell a defference if it works or not.
sorry to telll you this mate, but i bought a samsung ht-tz 312 at chrismas and that had the same problem, only mine would switch its self off after about five mins i took mine back and they swaped it saying it was a design fault ps mine did this from new email@example.com
You probably have too much power running to your power strip that you probably have your xbox, playstation, tv and home theatre system plugged into, try using seperate wall outlets for your tv and home theatre system