I've recently started to see a problem between my Hopper and my Sony SXRD set. I turn on the set and get no picture on the TV. After trying a number of things the reliable workaround I found is unplugging and re-plugging the HDMI cable on the back of the TV set. I think this means it's an HDMI handshake issue. This system has been working fine for years. Any ideas what is the cause of this new behavior?