So, I have now this warning.
The problem is that I didn't made any problematic activity on this site, and I don't have any question in negative vote count.
Anybody (mods?) could say, what is in the background?
P.S.: It is not a problem to me if you need to disclose "secret" info from my activity on this site, if it is needed to an explanation. It is also not a problem if you give me links to my deleted questions (which I can't see in my question list, but I can open if I get the link).