Every once is awhile double check its still on 1080I sometimes switching sources can send the box back to default, but I have noticed mine will finally default to 1080I , for about 2 months the default was 720p, so take hart Comcast users , sometimes they roll out the new boxes without the firmware signal in your neighborhood set up properly. But they fix it , thanks to competition , Dish , Direct , Verizon....Comcast has to make sure your HD quality is top notch. They dont want to loose your business.