Why do I get disconnected from chat?

Every time I enter a Yahoo chat room, after a short while I lose everything and get disconnected. Why? I don't have problems with other chat rooms though.

When I log onto yahoo mail the chat starts automatically. Several times a widow will open during my session telling me "You have been disconnected from chat because you have signed into Yahoo! Messenger from another computer of device". I have...

Why do I get a msg that says i have been disconnected from chat because i have logged in by using another computer or device. What is going on?

A message comes across the screen that says I have been disconnected from chat because someone else is on the same line with another device. I'm the only here. How can that happen?

I have the contacts box and request box but when I try to use them I get a message saying I'm disconnected because I'm signed in somewhere else. As far as I know I'm not signed in anywhere else, I also don't get any information about where to find what...

The notice tells me that I am signed onto Chat from another computer ... I only have one though.

I haven't signed in to anything, nor is there a 'device' that is 'signed in' so why do I keep getting this message? I also get a big 'error code 4' about looking for mail when I haven't even gone to check mail.

I have tried several times tonight to sign into Chat, and I keep getting a message saying I have been disconnected because I have signed on to another computer. I do not have another computer. My contact was trying to chat with me but I could not chat...

This usaully happens first thing in the morning when I log in the first time. I don't chat in yahoo and am wondering if someone is using my account.