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Question: LE46S704 to STB via HDMI

My LE46S704 does not appear to like having my AT&TUverse Motorola VIP1200 Series DVR connected via HDMI.. If I use component cables it is fine. Issue is this: When I turn the units off if for more than a couple of minutes when I turn them back on the only way to get the box to act right on the TV is reset the box. AT&T tech was here four hours last night, replaced my original box and said "Our box doesn't like your TV", and connected component cables and left. Any Ideas??????