Hi,
Thanks for getting back to me.
This was the first document I had opened since I installed 7.2.7.2 – it was an existing document that I wanted to edit.
I opened the document, then copied-and-pasted some text into it at the end. When I then did a cut-and-paste on the new text to put it in the correct place in the document, as I tried to make formatting adjustments the document would crash and Libre Office close.
When I tried to open another document, Libre Office offered the “Unsaved Document Recovery” option.
I haven’t tried a new blank document yet – it was too frustrating working on the existing document! 
I am running Kaspersky Internet Security (2022).
Thank you.