Plex playing problem on specific TV

Hello. I ve been using plex for some time and decided to buy old hp z620 with 64gb ram, radeon firepro v4900 and xeon e5 2665 cpu. I set up everything and it was working fine through all my devices, till yesterday. I have 2 lg smart tv, 1 old samsung smart, android phones, ipads,ps5…Everything works fine beside 1 lg smart tv in my bedroom. Yesterday 1 video played OK and second one and other are stuck at loading, sometimes it play for few seconds and then freeze again. I checked everything ,reinstalled plex, updated tv. Nothing works. For now I am using my ps5 to stream plex onto that tv, but it is not ideal. Any help what to check?

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