I have found a an interest connection abort situation. When I'm in channel and I do a DCC send (e.g.copy a file over) if the guy at the other end can't accept for whatever reason and it's left to timeout, them my mirc aborts out of all channels I'm currently in. Leaving just my irc.mircx.com status window open. I get connection timeout error message, and mirc is still running otherwise.
PS, yes I have read the above link.