I've had many problems with logging in the forum in the recent months. Although I type in my user and password correctly, very often the following error is displayed:

"vBulletin Message

Wrong username or password. You have used up your failed login quota! Please wait 15 minutes before trying again. Don't forget that the password is case sensitive. Forgotten your password? Click here!"

I try again after 15 minutes with the same result. Then I have to wait another 15 minutes and, if I'm lucky, after a few attempts I can finally log in in the forum. It is extremely annoying. Does anybody else have the same problem? What is the reason? Can it be repaired?