Export errors for various projects on a mac desktop

Hi all, so my brother and I have edited various projects on Adobe premiere pro. These range from 15-20 minute long short films shot on 6k and 8k cameras to short 10 minute videos shot in HD and most videos have had severe export issues on our system specifically. These vary from audio errors to visual glitches that are scattered all throughout the final export. 

We've tried using encoder, rendering at maximum depth, and exporting on other systems with varying results that all end up with either minor glitches or major glitches depending on the system that was used to export the file. We are currently panicking since these are huge school projects with large budgets that we need to export properly. Is there any chance it might be an issue with the mac, the hard drive, or premiere itself.

Are there any possibilities of fixing errors like these without restarting the editing process? Cause we're concerned with the possibility of having to re edit both film projects on other systems just to make sure they get finished, and if that's the case is there any easy method of copying elements from a premiere file without getting corrupted from our faulty system?