I had similar problems with our VSX-1021k. Sometimes the video would partially switch, leaving multiple images on the screen. I fixed that by limiting the DirecTV box to send only one screen resolution. The more perplexing problem was that the audio would disappear, usually after changing channels. That took two trips to the local Pioneer tech, who finally solved the problem by replacing the entire HDMI board.
9/28/12 at 9:06am