I just bought the HD cable. It seems to drop as soon as I shift the position of the Surface. I doesn't seem as though the cables are loose anywhere. I've tried locking the screen orientation before plugging the cable in, but I still get the same results. I can start up the TV display and watch use the Surface for a few minutes and start watching a video, but as soon as I tilt the Surface or lay it down, the tablet will beep and I'll lose the video, audio or both. Anyone have similar problems?