Gnus hanging

[Richard Riley <rileyrg@googlemail.com>]

I'm frequently on a wireless connection that fails. Gnus hangs if I do a
"g" (or more accurately C-u 5 g) in the group buffer to get new headers
if the link has gone down and come back up again - I assume because of
non valid network stream handles or whatever. What would be the best way
to ensure Gnus closes all network links first and reconnects prior to
the refresh other than quitting or closing/opening from the server
buffer?

regards
r.