There’s a 80Mbps limit on hevc video. See the specs here: https://developer.samsung.com/smarttv/develop/specifications/media-specifications.html
See the note where it mentions:
Media with higher bit or frame rate than specifications can cause video or audio playback to stall.
We’ve experienced this on many occasions, so we’ve limited the bitrate to 80Mbps so that videos will at least transcode and play vs video just failing on multiple occasions.