At least with those boxes, you have a less-expensive switching cost should they make your experience worse. A tv should only do one thing, display content which is fed to it. How you get that to the tv is less important than isolating the “smart” tv from the internet.
You let your tv connect to the intertubes?
First mistake.
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I’ve got a fairly new LG TV and I’ve never had that happen. Maybe the voice button on the remote gets pressed by accident?
How then do I get Plex running on it?
Get another box (like Apple TV) and use that.
You let that box connect to the innerwebs, second mistake.
You need to use a third box, and connect that one instead, obviously
At least with those boxes, you have a less-expensive switching cost should they make your experience worse. A tv should only do one thing, display content which is fed to it. How you get that to the tv is less important than isolating the “smart” tv from the internet.