I am on 200 Mbps connection and can confirm this buffer drop issue since late November. 4K 60 FPS is just stuck at buffering for most of the time. However plays fine in the browser. Interestingly there is no response from @samsung @Support on this and an acknowledgement that this is even an issue. In the back probably both Google and Samsung are haggling on who fixes it. Make the code open source and let us do the stuff if you can't fix it.
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