Only a short while back I never thought that I would be able to reach this point (due to continual LibreOffice crashes) but my document on 'Cloud and Internet Security' has reached 90K+, 318+ pages without much of a problem. There's still a bit of work and a lot of editing to do though.
The crashes resumed after copying/pasting in a new element. I can't be sure whether it was a picture or just pure text as the crash generally only occurs during automated autosaves so what is supposed to save you is actually causing you the problem. I've done a bit of research and its basically what I surmised earlier. It has something to do with formats/styles but not exactly in a way that you would think. It doesn't actually have to do with the content itself as the total number of formats/styles that are part of the document. The more you have the more likely the crashes are to occur.
Obviously, the cleanest way was to convert it to another format so that I could open it with a more reliable word processor. Ironically, even AbiWord, OpenOffice and CLI based tools had trouble with (opening, saving, and converting would result in timeouts or crashes) the document. Eventually, I recalled an add-on for Microsoft Word that would allow me to open ODT documents which seemed to work perfectly fine and also allowed me to convert to DOC format (converting to the more up to date DOCX format would result in freezes). I've since switched to the more stable, tested, and resilient Microsoft Word for now (LibreOffice still has problems with the new document but I've noticed that a lot of strange additional formatting decisions were made during cutting/pasting once I saw the Navigation Panel under Word. I will switch back to LibreOffice once they've figured some of these issues out.).
As an aside, I sometimes crimp/re-crimp my own network cables. Try to go after quality crimping tools/equipment. I just had a small batch of connectors just break. I suspect it partly had to do with the ambient temperature (very low) but I think its mostly down to QA problems. Please note that while stripping the network cable further back may allow you to more easily insert the cable into the connector it also means that it is more likely to lead to signal leakage/interference between individual wires in the long run (I've learnt this through personal experience).
Also, if you've ever come across the 'nm-applet' that sits on your taskbar and manages network connections (under UNIX/Linux) but it refuses to pickup a new connection try removing and reinserting the relevant network kernel module via 'rmmod' and 'modprobe'.