Gajim looses connection very often

Bug description

Every now and then (but quite often) Gajim looses my connection to server jabster.pl. I thought it's maybe a server issue but:

I didn't see any complaints on Jabster group site (and disconnecting problem has been present for a few weeks if I remember correctly...)
I added my gmail account and it was disconnecting, too. On the other hand, when I installed Gajim from Karmic repo on a fresh profile, it didn't threw mi out (so far). So it seems it's a Gajim bug.

Steps to reproduce

Run latest Gajim
Wait a bit, within 30 minutes it should disconnect from server (and reconnect shortly after)

Software versions

OS version: Ubuntu Karmic 9.10

GTK version: 2.18.4-1ubuntu2

PyGTK version: 2.16.0-0ubuntu1