FCP freezes on 140 min project

Hi all, I have a 140 min film project, shot in 4K but working in 2K, I have created both optimized and proxy media, working from G-Raid 12 Tb external drive, it was all roses until this last bit -- for some reason it started crashing. I am really worried I have to hand this in soon. Any and all help is appreciated, I am including screenshots of report (p.s. I tired removing preferences and sadly it didn't help)

Is the hang occurring when you open the project Library or when you open a Project/timeline?

Hi, it happens when I start working within the project.