A:AnswerA few things to check out is if the hdmi a 4K cord, also is it on a cable box and are the setting on it adjusted to the new tv, if it’s another device is that adjusted to the new tv. Also my tv was a little quirky when I got it but after I checked those things it went to what it’s supposed to look like.
A:AnswerI haven't seen that with this TV myself. I have seen that with low end TVs like Element, Seiki and RCA. I've ran an Xbox One and PS4 with no issues on this model Samsung.
A:AnswerYes it has a ethernet port for direct wire connection. Also you can use it without internet at all. You just wont be able to use any streaming apps