Identical H.264 MP4's, one plays the other does not.

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Identical files, both ripped with MKV and then converted to MP4 using Handbrake H.264 AC3 720.
Same preset for all 6 seasons, season six, same template (handbrake prog), same audio, same video, made 11 days apart from the last rip, all will play except season 6 files. Screen shots of Codec info: from VLC. Everything is identical. Again one plays, the other doesn't.
Same rip, program, codec, file type, pc, SSD and folder.

Any suggestions? Samsung UHD Smart TV. (VLC codec info for each attached.)

All of a sudden, in 11 days, the tv doesn't recognize an identical file. This is beyond frustrating.
(see attached)
Thank you,
Andy