[Dermot]

I can tell you that the recent disconnects are a wide area problem.

A lot of people have been disconnected from Yahoo! servers for no apparent reason.

This has been the case in all clients that connect to the yahoo! network.

It's either yahoo have messed up something with the removal of chat 2.0 or they are working on something.

Various servers at intervals are just refusing connections after dumping their connections (you get disconnected)

I'm sure within time they will fix the issue, to when is up to them.