A problem I've enocuntered a few times, and I bet I'm not the only one who's run into this ....
The icons/buttons for the existing conversations are a little too easy to mis-click on ...
when I am attempting to kill old conversations, I will frequently unintentionally revivify them .... which is the opposite of what I wanted to do ...
I suspect a little extra spacing between them might help, but what do I know