Samsung SPP4231 42-Inch Plasma TV with Installation
Minor Problems
I too had sound problems where the sound would go out after the tv had been on for about 3 hours.  After letting the tv cool down for around 15 minutes it was good again.  Bought it from Sears.  They replaced the digital/audio board with no resolution.  The techs were honest and told me they never had this problem with a Samsung before and weren't sure what the root of the problem was.  Tech called Samsung directly from my house.  Found it was the Power board was short circuting when heated up.  All replaced under the two year warranty.  No problems since repair.  Tech did tell me they had more problems similar to this with the toshiba's and Sony's. This TV has a great picture and is far better than most comparably priced tv's  I have the 3 year service agreement.  Tech said anyone who didn't buy the agreement was crazy.  Digital/audio board w/out labor was $512 and the power board was $212  labor was $181 first trip $222 the second since they had to take more of the tv apart.  Moral is: don't buy a plasma w/out a service agreement.