how can I enter chat room , cz suddenly I can't enter chat room any more?

[Na In Swan]

I feel very strange cz suddenly I couldn't use yahoo chat room already 3 days with this id ,but when I use other id in the same time , I can use yahoo chat room , is there any body can help me so I can enter chat room ?? or perhaps some 1 already made me become spams so I can't use yahoo chat room any more,thx for U help