What format (codec, container, extension) are the files? What version of MC24?
If you have a file that repeatedly causes the problem I think that is perfect. How big is it?
I think 5 of the past 7 releases (68, 69, 71, 72, 74) have all included fixes for hard failures when dealing with mp4 containers (m4a, mp4, mov, m4s, etc). It could fall into this category.