4K HDR PLAYABLE but buffering after 2 min on DIREKT PLAY to samsung smart tv(local play)

Plex Media Server
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ohh that may be it cuz i can whatch perfectly fine a 4K HDR video with 23 Mb/s bitrate
thx for the help. Where did u find the specs? i have a model from 2015 UE55JU7005.