I’m not using a Clipboard manager, but did notice that Microsoft installed/updated ClipChamp video editor recently. I never used it though.
So with OpenOffice, copying/pasting works for a few minutes, but then it too locks up after copying. LibreOffice consistently locks up with the very first copy. CPU goes up to 40% just like LibreOffice, but unlike LibreOffice, memory doesn’t continuously increment over time.