I'm also experiencing this issue and eventually managed to locate compiz as the
responsible package.
Here my post where I described the issue in some detail:
http://ubuntuforums.org/showthread.php?t=756906
Indeed being freezes terribly annoying this bug should be considered of
HIGH importance and be addressed as soon as possible, at least before
Hardy release.
If we can contribute somehow please let us know!
** Changed in: compiz (Ubuntu)
Status: Incomplete => Confirmed
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compiz randomly freezes X
https://bugs.launchpad.net/bugs/176589
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