Plex seems to be buffering alot on my Hisense TV. I am using Plex version 5.90.1 adn the VIDAA OS version is V0000.08.50A.0O0904.
I have a 50 Mbps line, TV is connected via LAN Cable directly onto Router. I have a new TP Link Archer AX55 Router.
Recreate the buffering problem, pull your Plex Logs, post the entire .zip file here, and then someone smarter than me will (probably) look at them and advise you.