Just gotmthis home cinema system before Christmas and have intermittent picture loss when playing DVD's and also experienced when playing movie into one of the HDMI inputs from Apple TV. The small 'HDMI' goes out on unit display and picture initially has horizontal black lines on bottom half of screen before disapearing completely for a second or so. The sound sound is not affected and im using a Samsung TV. Anyone have any idea why this may happen other than being faulty unit? Thanks        is