Yahoo Messenger Sign in problem

Hi,
Why I'm getting problem on yahoo messenger every time I log in?
This makes me change my password all the time to ensure safety and security of my yahoo account.
Every time I log in, I make sure that my username and password match and they are 100% correct.
But even if I put correct information, there's always an error and problem signing in.
I can open my account in yahoo mail but not on yahoo messenger.
Can anyone help me with this?
Thank you.
This is what happened every time I log on to yahoo messenger:

Sign-In Problem
There was a problem signing you in to Yahoo Messenger.
The password you entered is incorrect. Click "Close" to re-enter it, or click "Forgot Password…" if you have forgotten your ID or password. (810030002)
