Cannot View Part of Timeline Upon Playback

I am running version 16.2.7.010 of Resolve on Windows and I cannot view the second half of my timeline upon playback. I was previously able to view everything, so I have not had this problem with the project up until the past month or so. The clips are visible in the media pool and I can view the clip thumbnails and preview the audio in the timeline, but there is no video upon playback. I have plenty of available storage and memory left on the computer, and I have tried copying the timeline over into a new project and changing the render cache mode, yet nothing seems to work. Can anybody help?

What kind of media? (From what camera?)

What do you see in the Timeline Viewer for those clips?

What do you see when you load a problem clip into the Source Viewer?

The media is all MP4 video from a Panasonic Lumix G7.

Another note - I have tried swapping out the videos that won't play in for different videos, yet it still cuts out at the same timestamp on the timeline every time. There is still always audio, just never video.

This is the timeline viewer and source viewer the frame it cuts out on: