Been banned from posting by several websites

I've been trying to post threads on a website I use called 4chan and my ip address range has been banned from posting. In addition to that my computer is constantly heating up all the time and my internet connection is very slow. I was wondering if my ip address has been hacked or something as I have never posted anything objectionable on 4chan in my experience or if you've received any contact from them. Have you any idea that my ip address is being used in two locations.