I just got my Samsung PN42B450 last night from Sears. After about 3 hours of watching it, I started hearing a buzzing and clicking sound from the rear. The sounds went away, but an hour later the tv started shutting off the restarting. It did this about 4 times in a row. I shut the tv off. Now this morning the tv only stays on about 15 minutes, then shuts itself off. This is very frustrating.
I called the Samsung number on the manual. The woman sugested it was my cables. I'm using a Directv HD into the tv via HDMI. The same setup I've used for years with my Panasonic rear projection LCD with no problems.
Anybody have any ideas???