My employees have a problem with LibreOffice Calc documents for several years. When working with tables, they hangs randomly. This happens on different computers with Windows7 x86\64. I tried different versions libreoffice since versions 5.x(x86\64) with the default settings.
This problem occurs with different files.
Pls test with Menu/Help/Restart in safe mode. To avoid if something is inherited in the profile from previous versions.
If the problem is random this forum will not help you. It may be network problem, storage problem, bad addons, Windows permissions, bad excel files imported, some computers (or different user accounts in the same computer) may have different versions or options etc. etc.