This feedback window goes away (but keeps its contents) when Atom.app looses focus. Seems wrong.
+1. I'm my case, when I tried to send a bug the first time (as my email is not filled out by default), the email also disappeared.
The send "attach debug info" check box also gets unchecked when the app looses focus
Thanks @veganstraightedge and @ajessu. Closing this in favor of the more general issue: atom/atom#1918