gnus makes emacs lose response

[Leon]

Dear all,

If I am using gnus and disconnect the network cable, after a while
emacs will lose response. C-g won't work. I have to `killall emacs'. I
think this is due to demon trying to fetch news/emails.

My setting of demon in gnus:
--8<---------------cut here---------------start------------->8---
;; fetch email while idle
(gnus-demon-add-handler 'gnus-group-get-new-news 3 t)
(gnus-demon-init)
--8<---------------cut here---------------end--------------->8---

Regards,
-- 
Leon