Direct Play issues with certain films

[chimpfacts]

I have been using my jellyfin server for a few months now, it has mostly worked quite well however there are a few films I have found that will always buffer at the same points when streaming, some refuse to play at all freezing at the same point each time.
None of these films are being transcoded, all playing via. direct play. I have tested each of them on google chrome as well as the jellyfin media player desktop app with the same results for both.

Below are two examples of films that buffer consistently:
Video
Title: English - 1080p - H264 - SDR
Codec: H264
AVC: Yes
Profile: High
Level: 41
Resolution: 1920x1080
Aspect ratio: 16:9
Interlaced: No
Framerate: 23.976025
Bitrate: 41633 kbps
Bit depth: 8 bit
Video range: SDR
Video range type: SDR
Pixel format: yuv420p
Ref frames: 1
NAL: 4

Video
Title: 1080p H264 SDR
Codec: H264
AVC: Yes
Profile: High
Level: 41
Resolution: 1920x800
Aspect ratio: 2.40:1
Interlaced: No
Framerate: 23.976025
Bitrate: 10381 kbps
Bit depth: 8 bit
Video range: SDR
Video range type: SDR
Pixel format: yuv420p
Ref frames: 1
NAL: 4

And this is for a film that never buffers:
Video
Title: 1080p H264 SDR
Codec: H264
Codec tag: avc1
AVC: Yes
Profile: High
Level: 41
Resolution: 1920x816
Aspect ratio: 2.35:1
Interlaced: No
Framerate: 23.976
Bitrate: 2499 kbps
Bit depth: 8 bit
Video range: SDR
Video range type: SDR
Pixel format: yuv420p
Ref frames: 1
NAL: 4

All seem to have near-identical encoding and the logs don't throw anything unusual during playback, I'm unsure what else to look for.