Just replaced a Gen 1 with an Ultra. Setup was easy. Menus display, screensavers, etc. all good.But - frequently (but not always) when we watch Netflix or Prime, the video doesn't display.Using a Marantz 7013 AVR to an older plasma 1k TV. I'm guessing it's a video standards issue, but in config, I have it set on 1080p and again - all static elements display consistently.While playing I'm getting audio and subtitles, w/o video.But if I reboot the Roku, the video will appear.Any suggestions??