Hello, my tablet is suffering from the very same issue. Please be informed that this is already my second tab s4. I have returned the first one hoping that only one piece was faulty. I was wrong. The problem was present even on a showcase tablet in a store. Altogether I was able to reproduce the issue on 3 devices (wifi versions only). The shop assistant confirmed the issue after I showed him the "no lag phenomenon" on my s9+. Reported the problem through samsung members Poland already two times (with logfile attached). No feedback so far. I am forced to use bt speakers for videos as the lag of roughly 200 ms completely ruins the watching experience. Just search for "audio video sync test 60 fps" on yt and see for yourself.
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