Meta: "you are banned"-Bug

[m.e.]

Hello, for some reason I often get "I'm sorry, but you are banned. You may not post, read threads, or access the forum. Please contact your forum administrator should you have any questions." But after just a minute or so I can access the forum. I did not do anything to cause this. I simply write a message. After 10 minutes of writing I want to post it, but then I get "you are banned". It is not a problem for me because I know it will work soon, but other users could be confused.