Hello - Still working on my friend's holiday and noticed that the problems I have to render some of his clips are often clips that were taken accidentally when the camera was either left on, or accidentally switched on instead of off, as the meaningless footage clearly indicates.
Perhaps someone has some ideas on this and how to detect it; although writing this I'm answering part of my own question, that would be to play all the clips before import in premiere and eliminate those useless clips. Even before rendering PP is very unstable whilst these clips are on the timeline.
I don't know if there are any correlations in this or it is purely coincidental but this is my experience in this project.