I've been banned on the superuser site (not for trolling or spamming but for low quality that anyway solved just the technical problem I was posting about) so that my account on superuser is not being accepted for asking question which I've been able to fix by improving the account since improvements are allowed even though I was banned.
I would have been better off with a big red warning that I was close to getting banned but I didn't see it coming even though I knew I was posting mediocre question just to solve a technical problem.
Now I wonder if you can tell me if there's way to get warning if I'm close to being banned?