I have a 40 page document originally written in Word, using .docx form. When I open in in Ubuntu/LibreOffice/Writer, scrolling down using my mouse scroll crashes it every time. I tried copying it, no help. I converted it to .odt, no help. It happens at different points in the scrolling each time, and freezes everything except the mouse. I have to cold boot the system.
I am currently working with a 400 pages document in Kubuntu 16.04 and LO 5.3.3.2 with no problems at all.