When I run LibreOffice in my kali Linux platform most the time it freezes my entire system. for an instant when I’m choosing a template for CV it appears after 15 or 20 and during that time of period the computer is in freeze state which I can’t do any of my activity (this happens only when I work with LibreOffice). please give me a solution to this matter.
And you are using which LibreOffice version from which repository (Debian?) and on which desktop manager (Xfce or still GNOME)?
Did you already try to run LibreOffice in Safe Mode (Help -> Restart in Safe Mode) and check whether the problem is being fixed then?
I doubt the entire system is freezing, i.e. you’d probably still be able to switch to a console and login etc. The graphics window system may be freezing, but if it happens after a certain amount of time it might as well be a CPU or GPU failure due to heating or other hardware problems, also RAM failure is possible, or swap space on disk is faulty, or … too many unknown variables.