Yep, multi-server support was added about 5 years ago
I haven't heard of anyone having this issue thus far (not that every post here is in my memory), however, typing
/server -m irc.server.here starts a new server connection. I don't know why it would disconnect you from a previous server connection.
It would probably be easier to identify your issue if you provided the disconnection message.
Edit: Err, just re-read the post and figured you were simply unaware of the -m switch, and therefore using /server or whatever in conjunction with an active connection, which would indeed result in the disconnection of the active server! I thought you were connecting to a second connection and it was causing you to disconnect from the last one. Indeed, just follow Collective's response and all should work out fine.
Regards,
