I never had an issue with Netflix on my 4k TV. About 2 weeks ago I noticed it started counting 1% at a time when loading a show then after it finally loads it plays at 240 quality and goes up to 288 max. It happens on all shows. Amazon Prime video streams 4k content no problem. Youtube and Twitch same thing with no issues so its only Netflix.
My theory is net neutrality repealed came into effect and Comcast wants to charge for "fast lanes".
I talked with Comcast CSR because my speed is faster then its suppose to be and asked if my area got a speed increase. She said no. Then I explained my Netflix issue and after some checking she said to contact Netflix. I am on Blast 100/10 but my speeds are 120/12.
I call Netflix and she goes thru the same procedure posted on their website which I already done then tells me to contact my ISP.