Timelapse Footage Plays Fine in Premiere Pro but Freezes After Export

Question - I do video editing work for my job. On my old computer, I was able to export with the usual settings in Premiere just fine - h.264, 29.97, full HD, etc. However, my company recently got me a new computer (with NVIDIA and Ultra 7 to help with all the video editing I'm doing), but for whatever reason, my exports are now messing up with the same exact settings. 

The videos I do are a mix of regular footage and timelapse footage, all filmed with a Go-Pro. The timelapse footage looks great when editing in Premiere, as well as in the preview section of the export screen. However,  no matter what I do, when I export the file and then go to play it on my machine, the time lapse footage freezes and only plays a couple of frames. The background music and graphics continue to play as normal, it's just the timelapse footage that doesn't play correctly. I imported this file back into Premiere and confirmed it was the file, not the video player. 

I have tried messing with settings, matching to source as much as possible, and have even went through exporting it with the encoder, all to no avail. It looks like it's going to play fine on the preview, export it, open the file, and the timelapse footage stays on random shots for several seconds while the rest of the video continues. Any tips/tricks? I'm thinking it has to be some setting with my computer, as I was able to successfully export on my old computer which had a much more pitiful graphics card and processor. Thank you!