I just upgraded last weekend from HR10 to HR21-100. Last night the screensaver kept popping up every 5 minutes while watching buffered Live TV. I just kept hitting the play Play button and the picture would instantly come right back. I was even fast forwarding during commercials so there certainly wasn't inactivity on the remote. After I finished the show I changed channels and the screensaver stopped popping up. I'll try a restart to see if that helps. My HR21-100 is connected via HDMI through an AVR.