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Move the streaming device to be connected via cable and not wifi.If the internet is not strong enough for the media to work with, and the client has been set up to play maximum, then it will try to cram through whatever huge. Plex will detect the bandwidth automatically. When your Plex playback keeps buffering and lagging, the first thing is to check if you're on Ethernet or Wi-Fi. Do remember to restart the server after the purchase of a Plex Pass.
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It's very annoying that the movie stops every minute for few seconds. I got a Synology DS718+ and when watching movies h.264 1080p on my Samsung TV QE55Q7, the Plex keeps lagging constantly.
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If I fast forward to half way, it will buffer forever. When I watch a 4K HDR file streaming from my Western Digital My Passport Wireless Pro to my LG OLED LG OLED55E6P using the Plex app, I get buffering throughout the film to the point where I have to stop watching it. Plex Buffering & Stuttering Issues with 4K, Xbox One
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