Choppy motion in .mp4 videos seen on Sony A95L TV

I stream and capture videos from websites for my personal use. Sometimes the videos (.mp4 files, 1080p or 4K, at 60 FPS) have "choppy" motion if I play them on my Sony A95L TV (available as of about a month ago, ie, very new processor and software). I see the choppiness in playing/casting the videos via Plex, via Edge and via Chrome. I see the choppiness if I use the TV's ethernet capability to get to the video files directy.

I don't see choppiness if I play the videos on my computer monitor, eg, in VLC or MPV (or PP) or in Edge/Chrome without casting. Obviously, the processors/software are entirely different as between my TV and my computer monitor, but the smooth motion on my monitor suggests a "cure"/workaround for my TV may exist.

In cases where I can download a video from a website, I can play it on the TV via Plex without choppiness. I cannot, unfortunately, find anything in such a downloaded file that tells me why there is no choppiness. The only suggestive thing in such a file is that it's a constant 25 FPS (according to MediaInfo).

I've experimented (via HandBrake) with different FPS settings, to no avail.

My question: What settings in PP might help in getting .mp4 files with 60 FPS to show with smooth motion on my A95L TV?