emacs starts without warning every monday

[harven]

I am running emacs23.2+1-5 under debian squeeze.

Since last upgrade (a month ago ?), I have noticed that some emacs instance
starts on every monday munching 30% CPU for a quarter of an hour and stops.
After further investigation, I can see that there is a job in /etc/cron.weekly
calling a script /usr/sbin/update-auctex-elisp, whose purpose seems
to execute the command TeX-auto-generate-global.

>From the auctex manual, TeX-auto-general-global is not supposed to be running
every monday but only after install or upgrades. This monday cronjob is 
probably debian specific, there is even a (almost 2 years-old) bug filled in 
the BTS (#478733), but strange enough, the problem is quite new for me.

I removed the script from /usr/sbin but auctex now barfs in the journal and
starts creating auto/ directories everywhere (not sure this is due to the
removal, maybe this is just a new feature). I looked at the auctex manual 
to get ride of this behavior without success.

Is there a way to revert to the old behavior (no script in the crontab and no
auto/ directories, preferably by putting some elisp code in .emacs, 
so that the problem won't appear again at each upgrade) ?