Yesterday i had the same problem. My License will expire in 13days.
the icon was also changing every few seconds. if i open the Gui, it closes instantly.. after a few trys the icon was dead.. i can't click on it any more. Seconds later my PC was complete offline. i also cannot start any system programs or do a reboot.
i hit the reset button. i logged back into windows, and jumped into the systemsettings as fast as i can and uninstall NOD32. Afterwards all programs works perfect. i tried again to install NOD32 (with live installer). NOD32 did an update and make his first PC Scan. All works perfect for the moment. Minutes after the Scan has been finished, my PC goes offline again.
i hit reset again.
then i changed the date to saturday, 8.2.2020. so, NOD32 works perfect now.
but this was not a final solution for me, so i uninstalled it again and now i wait for a bugfix oder something else.
the last log entried, that i saw was "Der Versuch, das Stammzertifikat allen bekannten Browsern auf Ihrem Computer hinzuzufügen, ist fehlgeschlagen". i also searched the windows event viewer. i can provide this information later the day. but it was also full of errors with Nod32. it looks like that Nod32 prevent windows from starting system programs.