I just purchased a 40" Samsung LNT 4061F LCD HDTV. When I view the TV through the HDMI 1 port after 30 minutes to 2 hours I lose video but not sound. The screen is still working on the TV if I switch to other sources or select the menu button, so I know the TV screen is working. The only way to get the video back is to turn the TV off and back on. If I use the component connections this problem doesn't exist.

Any ideas?