"updatable modules upgrades" could be the culprit. Some modules updates were casuing problems in my KIS2018(h) sometimes after the release of KFA2019 with system watcher. It's d starting point, then I upgraded to KIS2019- the severity of crash lessened but not mitigated. In KIS2018 some system crash used to change user rights but in KIS2019 that wasn't the case. I was having some awkward times with KIS, & it took a while to fix d issue.
AS I mentioned, after that database corruption no sys crash has happened yet. I just hope no such case resurfaces again. & thanks for your constant inputs:emoji_ok_hand

y). I really appreciate that.