It's ironic, but it's been very helpful to see that others have experienced the exact same thing I have and that I am not just imagining things. I just swapped out for the 4K box as well and the picture is nowhere near as good as the old HD DVR box that I had for everyday TV watching (such as the local news). I have tried all of the suggestions thus far posted in this forum and none of them helped me either. I have a new Sony 4K OLED TV where all 4 HDMI ports support HDCP 2.2 and I'm using new high end Audioquest HDMI cables that are designed for 4K. I'm also using a Panamax electrical line conditioner to help filter out any "noise" that would interfere with the picture. So, it's pretty clear it's the box, not my equipment or menu setting choices that account for the decreased picture quality.
It's not uncommon for first generation devices to have problems and for them to be improved over time. I'll be taking my 4K box back and getting my old HD one and then perhaps down the road get a 4K box when Comcast improves on its hardware (and there is more 4K content). It's just diappointing because I was hoping to watch sports in 4K (HDR), but it's not worth it if my picutre quality is worse the rest of the time I'm watching things. Also a waste of my time to have to go back and forth swapping out boxes. At least my TV has very good 4K streaming (Netflix, Prime, etc) already built into it so I don't have to rely on the comcast box for that.
... View more