Having the same problem. Unable to copy and paste to another doc as it closes as soon as settles from loading.
Previously, I have been working on large documents and the refresh time when saving has been long ("Not responding").
Upgraded to 4.1.5 but still happens. No problem with small documents, my large doc contains text, photos and tables, and I have successfully written two docs of 180 and 200 pages (and they open OK).
This is my third large document and I went back to a saved copy on external hard disk, which was not as big, but now I have started to catch up where I was, it opens and closes just like the original. The doc was saved then exited correctly, with no hint of an issue.
I have run Tune Up Utilities and defragged without success in getting past this problem.
I am using Windows 10, not 7.
I was on a deadline to complete the project, which is fast running out. To start again will be hard graft and there is always going to be the expectation of getting so far then Wham!

Surprisingly I can open in File Viewer Plus by Sharpened Productions to look at it but not edit, save etc unless I upgrade to the Paid Version - which I might have to do. Copy and Paste into OO does not save tables, photos and changes the font and format.