I think I've finally figured this one out. Adam Niedling's suspicion
turned out to be correct. It's a problem with my video hardware. Somehow
it causes these lockups occasionally. My best guess is the PCIe
contact's not so good causing Ubuntu to hickup. Once I "service" the
card, then everything's fine again for a long spell. This is probably
explains the lack of kernel BUG messages but I'm not too sure about
that.
What I do find strange though is that this doesn't seem to happen when I
use older versions of Ubuntu or even Windows XP.
Anyway thanks for everyone's efforts and sorry for the false alarm.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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Soft lockups in Hardy shortly after boot up
https://bugs.launchpad.net/bugs/250837
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