A:AnswerWow, that does not sound good. I have had the Q6F for over a month and no trouble with redlines. But does it happen on all your inputs, cable box, while streaming etc. Check your cables, are they in tight, maybe your hdmi cables is bad or the cable between the one connect box and the tv is loose. Try calling Samsung support to see if they have any suggestions. If nothing fixes the issue, I would exchange the TV if you can, its rare but like any electronic item you can just get unlucky. Otherwise you will need to go through a Samsung warranty claim.
A:AnswerI am only using two of the four inputs but it seems like all of them are ultra HD compatible. Some cable and local channels may not broadcast in ultra HD yet so the picture is much better with Netflix and Amazon (streaming channels).
A:AnswerThis Samsung QLED is incredible. It is beautiful and works perfectly. Zero complaints. As long as you get a good deal on it you will have made the right choice. Just saying. Sorry I cannot actually answer your question and sorry if this wastes your time. Thank you